List of auxiliary Interstate Highways

Dwight D. Eisenhower National System of Interstate and Defense Highways
Highway shield for Interstate 295
Interstate Highways in the 48 contiguous states
System information
Formed:	June 29, 1956[1]
Highway names
Interstates:	Interstate X (I-X)
System links
Interstate Highway System Main Auxiliary Suffixed Business

The auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards, they receive the same percentage of federal funding (90%), and they comply with other federal standards.

Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat these as bypasses.

These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer interstates may have many such supplemental routes, the numbers may repeat in each state along their route, but they will not repeat within a state.

Terminology and guidelines

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because there are none available, causing a "non-standard" number to be used.

Spur route

An Interstate Highway spur route's number usually has an odd number for its first digit.^[2] It is usually one of the following:

• It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street/avenue or at a substandard freeway, such as I-180 in Lincoln, Nebraska.
• It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
• It may connect two unrelated Interstate highways—such as I-390 in New York State and I-355 in Illinois do.
  • Note that states differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.

Examples of Interstate Highway spur routes are listed below.

• I-110 in California links I-10 with the Port of Los Angeles. This freeway was built before Interstate Highways as the Harbor Freeway. Later, it was adopted into the Interstate Highway System.
• I-180 in North-Central Pennsylvania connects Williamsport and Lycoming County with I-80 in Milton, which does not actually enter Lycoming County. I-180 also serves as a connection to those traveling to New York and I-86 via U.S. Route 15 and the Future I-99 Corridor at its western terminus.
• I-190 in New York connects the cities of Niagara Falls and Buffalo with I-90.

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples are listed below.

• I-380 in Northern California is located at the San Francisco Bay Area. This highway begins at I-280, and it connects with US 101.
• I-190 branches off from I-290 in Massachusetts, and it never connects with its parent, I-90.
• I-795 in Baltimore County, Maryland branches off from I-695.

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.^[2]

Examples of bypass routes are listed below.

• I-215 in Utah travels part of the perimeter of Salt Lake City.
• I-220 in Louisiana serves as a bypass of downtown Shreveport.
• I-440 forms a loop around the south side of Nashville.

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini, however they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.^[2]

Some examples of beltways are listed include:

• I-275 in Ohio, Kentucky and Indiana encircles the city of Cincinnati.
• I-465 in Indiana, also called the "USS Indianapolis Memorial Highway" and often times just "465," encircles the city of Indianapolis.
• I-495 in Maryland and Virginia encircles the city of Washington, D.C. and is referred to as "The Capital Beltway".

Auxiliary Interstates

Number	Length (mi)[3]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
H-201	4.10	6.60	H-1 in Halawa	H-1 in Honolulu	1989[4]	current	Signed as Route 78 until 2004
I-105	17.32	27.87	SR 1 in El Segundo	I-605 in Norwalk	1963	current	Replaced segments of SR 42
I-205	12.97	20.87	I-580 near Tracy	I-5 near Tracy	1970	current
I-305	6.00	9.66	I-80 in West Sacramento	I-80 Bus/US 50/SR 99 in Sacramento	1981	current	Unsigned
I-405	72.15	116.11	I-5 in Irvine	I-5 in Mission Hills	1964	current
I-505	32.98	53.08	I-80 in Vacaville	I-5 in Dunnigan	1977	current	Originally part of Interstate I-5W
I-605	27.40	44.10	I-405 in Seal Beach	I-210 in Irwindale	1964	current
I-805	28.02	45.09	I-5 in San Ysidro	I-5 in Sorrento Valley	1959	current
I-905	8.96[5]	14.42	I-5 in San Ysidro	Fed. 2 at the United States-Mexico border in Otay Mesa	proposed	—	Currently SR 905, proposed to be signed as an Interstate
I-105	3.49	5.62	OR 99 in Eugene	I-5 in Springfield	2011	current
I-405	3.53	5.68	I-5 in Portland	I-5 in Portland	1950	current
I‑205	36.64	58.97	I-5 in Tualatin, OR	I-5 in Salmon Creek, WA	1975	current
I‑405	30.30	48.76	I-5/SR 518 in Tukwila	I-5/SR 525 in Lynnwood	1964	current
I‑605	—	—	—	—	proposed	—	Proposed to bypass Seattle
I‑705	1.50	2.41	I-5/SR 7 in Tacoma	—	1990	current	Schuster Parkway in Tacoma
I-110	20.43	32.88	SR 47 in San Pedro, Los Angeles	I-10/SR 110 in Los Angeles	1978	current	Originally part of US 66, then signed as SR 11
I-210	48.72	78.41	I-5 in Sylmar	SR 57/SR 210 in Glendora	1964	current	Segment from SR 57 east to I-10 is still signed as the state highway SR 210, formerly SR 30 prior to 2007.
I-710	19.66	31.64	Terminal Island in Long Beach	Valley Boulevard in Alhambra	1983	current	Originally signed as SR 7
I-110	6.94	11.17	US 98 Bus near Pensacola	I-10 near Pensacola	1969	current
I-110	8.89	14.31	I-10 in Baton Rouge	US 61 in Baton Rouge	1965	current
I-210	12.40	19.96	I-10 near Sulphur	I-10 in Lake Charles	1962	current
I-310	11.25	18.11	US 90 in Boutte	I-10 near Kenner	1993	current
I-510	5.10	8.21	LA 47 in New Orleans	I-10 in New Orleans	1992	current
I-610	4.52	7.27	I-10 at the Orleans-Jefferson Parish	I-10 in New Orleans	1956	current
I-910	9.70	15.61	US 90 Bus in Marrero	I-10 in New Orleans	1999	current	Unsigned
I-110	4.10	6.60	US 90 in Biloxi	I-10 in D'Iberville	1988	current
I-310	—	—	US 90 near the Port of Gulfport	I-10 in Gulfport	proposed	—	Future spur into Gulfport, MS
I-110	0.92	1.48	Av Abraham Lincoln at the United States-Mexico border in El Paso	I-10 in El Paso	1967	current	Shortest signed Interstate in the country
I-410	49.49	79.65	Beltway around San Antonio		1959	current
I-610	37.97	61.11	Beltway around Houston		1975	current
I-215	54.50	87.71	I-15 in Murrieta	I-15 in Devore	1982	current	Originally signed as I-15E, then SR 215
I‑115	1.19	1.92	I-15/I-90 in Butte	Iron Street in Butte	1971	current
I‑315	0.83	1.34	I-15 in Great Falls	I-15 Bus/US 89 in Great Falls	1960	current	Unsigned
I‑215	11.10	17.86	I-15/Clark County Route 215 near Paradise	I-515/US 93/SR 564 in Henderson	1996	current
I‑515	20.54	33.06	US 93/US 95 in Henderson	I-15/US 93/US 95 in Las Vegas	1976	current	Not signed until 1994
I-215	29.02	46.70	I-80 in Salt Lake City	I-15 in North Salt Lake	1963	current
I‑516	6.49	10.44	SR 21/SR 204 in Savannah	SR 21 in Garden City	1985	current
I‑520	16.14	25.97	I-20 in Augusta, GA	I-20 in North Augusta, SC	1980	current
I-220	17.62	28.36	I-20 in Shreveport	I-20 in Bossier City	1991	current
I-220	12.01	19.33	I-20 in Jackson	I-55 in Ridgeland	1981	current
I-820	35.17	56.60	I-20 in Fort Worth	I-20 / US 287 in Fort Worth	1959	current
I‑222	—	—	I-22 near Birmingham, AL	Interstate 422 near Birmingham, AL	proposed	—
I‑422	—	—	I-20/I-59/I-459/US 11 in Bessemer	I-59 in Argo	proposed	—
I-124	1.97	3.17	I-24 in Chattanooga	US 27 in Chattanooga	1960	current	Unsigned
I-225	12.00	19.31	I-25 in Denver	I-70 in Aurora	1976	current
I-126	3.68	5.92	I-26 in Columbia	US 21/US 76/US 176/US 321 in Columbia	1961	current
I-526	19.26	31.00	US 17 in Charleston	I-526 Bus/US 17 in Mount Pleasant	1989	current
I-129	3.48	5.60	US 20/US 75/US 77 in South Sioux City, NE	I-29/US 20/US 75 in Sioux City, IA	1976	current
I-229	14.97	24.09	I-29 in St. Joseph	I-29/US 59/US 71 in St. Joseph	1986	current
I-229	11.33	18.23	I-29 in Sioux Falls	I-90 near Sioux Falls	1966	current
I-130	—	—	—	—	proposed	—	Proposed route in Texarkana
I-430	12.93	20.81	I-30/US 67 in Little Rock	I-40/US 65 in Little Rock	1980	current
I-530	46.65	75.08	US 65 in Pine Bluff	I-30/I-440 in Little Rock	1999	current
I-630	7.40	11.91	I-430 near Little Rock	I-30 in Little Rock	1985	current
I-235	13.78	22.18	I-35/I-80 in West Des Moines	I-35/I-80 near Des Moines	1961	current
I-135	95.74	154.08	Kan. Tpk./I-35 in Wichita	I-70/US 81 in Salina	1976	current
I-235	16.52	26.59	I-135/US 81 in Wichita	I-135/US 81/K-15/K-254 in Wichita	1965	current
I-335	50.13	80.68	I-35/Kan. Tpk./US 50 in Emporia	I-470/Kan. Tpk. in Topeka	1987	current
I-435	80.81	130.05	Beltway around Kansas City, KS and Kansas City, MO		1965	current
I-635	8.90	14.32	I-35 in Overland Park, KS	I-29/US 71 in Kansas City, MO	1968	current
I-335	2.74[6]	4.41	I-94 in Minneapolis	I-35W in Minneapolis	1964	1978	Cancelled
I-535	2.78	4.47	I-35/US 53 in Duluth, MN	US 53/WIS 35 in Superior, WI	1971	current
I‑235	5.36	8.63	I-35/I-40 in Oklahoma City	I-44 in Oklahoma City	1989	current
I-635	37.00	59.55	SH 121 in Grapevine	I-20 in Balch Springs	1959	current
I-238	2.23	3.59	I-880 in San Leandro, CA	I-580/SR 238 in Castro Valley, CA	1983	current	Considered an auxiliary route of I-80 in California; there is no I-38
I-440	9.96	16.03	I-30/I-530 near Little Rock	I-40/AR 440 near Little Rock	2003	current
I-540	15.87	25.54	US 271/AR 253 near Fort Smith	US 62/US 71 in Bentonville	1965	current
I‑140	6.79	10.93	US 17/US 421 near Navassa	I-40/US 17 in Wilmington	2008	current
I‑240	9.54	15.35	I-26/I-40/US 74 near Asheville	I-40/US 74A in Asheville	1980	current
I‑440	16.77	26.99	I-40/US 1/US 64 near Cary	I-40 near Raleigh	1991	current
I‑540	25.84	41.59	I-40 near Durham	I-495/US 64/US 264 near Knightdale	1997	current
I‑840	5.77	9.29	I-40/I-73/US 421 in Greensboro	I-40/I-85/I-785/I-85 Bus. in Greensboro	2011	current
I‑240	16.22	26.10	I-44/US 62 in Oklahoma City	I-40/US 270 in Oklahoma City	1965	current
I-140	11.17	17.98	I-40 near Farragut	US 129 near Alcoa	1987	current
I-240	19.27	31.01	I-40 in Memphis	I-40 in Memphis	1970	current
I-440	7.64	12.30	I-40 in Nashville	I-24 in Nashville	1987	current
I-640	7.03	11.31	I-40 in Knoxville	I-40 in Knoxville	1982	current
I-840	77.28[7]	124.37	I-40 near Dickson	I-40 near Lebanon	2016	current
I‑244	15.75	25.35	I-44 in Tulsa	I-44 in Tulsa	1970	current
I‑444	2.51	4.04	I-244 in Tulsa	I-244 in Tulsa	1970	current	Unsigned
I-345	1.40	2.25	I-30/I-45 in Dallas, TX	US 75 in Dallas, TX	1973	current	Unsigned
I-555	49.8	80.1	I-55 in Turrell	AR 91 in Jonesboro	2016	current
I-155	32.13	51.71	I-74 in Morton	I-55 in Lincoln	1992	current
I-255	30.82	49.60	I-55/I-270 in Mehlville, MO	I-270/IL 255 in Pontoon Beach, IL	1986	current
I-355	32.51	52.32	I-80 in New Lenox	I-290 in Itasca	1989	current
I-155	15.93	25.64	I-55 near Hayti, MO	US 51 at Dyersburg, TN	1980	current
I‑359	2.30	3.70	I-20/I-59 in southern Tuscaloosa	15th Street in downtown Tuscaloosa	1983	current
I‑459	32.80	52.79	I-20/I-59 in Bessemer	I-59 in Trussville	1984	current
I‑759	4.50	7.24	I-59 in Attalla	US-411/SR-759 in Gadsden	1986	current
I-164	0.69	1.11	US 41/Veterans Memorial Parkway in Evansville, IN	I-69 in Evansville, IN	1990	current	Unsigned, formerly 21.39 mi (34.42 km);[8] majority of former routing now part of I-69[9]
I-264	22.93	36.90	I-64 in Louisville	I-71 in Louisville	1956	current
I‑264	25.07	40.35	I-64/I-664 in Chesapeake	Parks Ave in Virginia Beach	1960	current
I‑464	4.71	7.58	I-64 in Chesapeake	I-264 in Norfolk	1960	current
I‑564	3.03	4.88	SR 337	I-64 in Norfolk	1970	current
I‑664	20.21	32.52	I-64/I-264 in Norfolk	I-64 in Hampton	1971	current
I‑165	4.90	7.89	US-43 in Mobile	I-65 in Mobile	1994	current
I‑565	21.40	34.44	I-65/US-72/SR-20 in Decatur	US-72 in Huntsville	1991	current
I-265	6.73	10.83	I-64 in New Albany, IN	SR 62/SR 265 in Clarksville, IN	1977	current	To be connected with I-265 in Kentucky in late 2016 with the completion of the East End Bridge
I-465	52.79	84.96	Beltway around Indianapolis		1970	current
I-865	4.72	7.60	I-65 near Indianapolis	I-465 near Indianapolis	2002	current
I-265	24.48	39.40	I-65/KY 841 in Heritage Creek	I-71/KY 841 in Prospect	1977	current	To be connected with I-265 in Indiana in late 2016 with the completion of the East End Bridge
I-469	30.83	49.62	I-69 in Fort Wayne	I-69 in Fort Wayne	1995	current
I-369	—	—	Future I-69/Pennyrile Parkway in Henderson	US 60 in Owensboro	proposed	—
I-269	4.20	6.76	I-55/I-69 in Hernando, MS	I-69 in Millington, TN	2015	current	Currently under construction; partially open
I-169	—	—	Union City, TN	Martin, TN	proposed	—
I-169	1.50	2.41	I-69E/US 77/US 83 in Olmito	Port of Brownsville main entrance in Brownsville	2015	current	Currently under construction; partially open and co-signed with SH 550
I-369	3.50	5.63	Tenaha	Texarkana, Texas	2013	current	Partially completed in 2013
I-270	5.31	8.55	I-25/US 36 at Welby	I-70/US 36 at Denver	1965	current
I-270	50.59	81.42	I-55/I-255 in Mehlville, MO	I-55/I-70 near Troy, IL	1956	current
I-470	13.72	22.08	I-70 in Topeka	I-70/Kan. Tpk. in Topeka	1960	current
I-670	2.81	4.52	I-70 in Kansas City, KS	I-70 in Kansas City, MO	1968	current
I-170	2.3	3.7	I-70	US 40	1969	1983	Cancelled
I-270	34.40	55.36	I-70 near Frederick	I-495 north of Bethesda	1975	current
I-270 Spur	2.10[10]	3.38	I-270 east of Potomac	I-495 northwest of Bethesda	—	—
I-370	2.54	4.09	I-270 in Gaithersburg	MD 200 in Derwood	1988	current
I-170	11.17	17.98	I-64/US 40 in Richmond Heights	I-270 in Hazelwood	1956	current
I-470	16.72	26.91	I-49/I-435 in Kansas City, MO	I-70 in Independence, MO	1983	current
I-270	54.97	88.47	Beltway around Columbus		1964	current
I-470	6.69	10.77	I-70 near Blaine, OH	I-70 in Elm Grove, WV	1976	current
I-670	9.37	15.08	I-70 in Columbus	I-270 near Port Columbus International Airport	2003	current
I-271	46.06	74.13	I-71 near Medina, OH	I-90 in Willoughby Hills, OH	1964	current
I-471	5.75	9.25	I-275 near Newport, KY	I-71 in Cincinnati, OH	1981	current
I-172	19.69	31.69	I-72 in Quincy, IL	US 24 in Quincy, IL	1995	current
I-474	14.88	23.95	I-74 in Peoria, IL	I-74 in Morton, IL	1973	current
I‑274	—	—	—	—	proposed	—	Proposed route in Winston-Salem
I-175	1.44	2.32	I-275 in St. Petersburg, FL	SR 687 in St. Petersburg, FL	1980	current
I-275	60.64	97.59	I-75 near Memphis	I-75 in Wesley Chapel	1973	current
I-375	1.34	2.16	I-275 in St. Petersburg	US 92 in St. Petersburg	1979	current
I‑475	15.83	25.48	I-75 in Macon	I-75 in Macon	1965	current
I‑575	30.97	49.84	I-75 in Kennesaw	SR 5 west of Nelson	1985	current
I‑675	11.04	17.77	I-75 in Stockbridge, GA	I-285 southeast of Atlanta, GA	1987	current
I-275	83.71	134.72	Beltway around Cincinnati, OH		1962	current	Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
I-275	35.01[11][lower-alpha 1]	56.34	I-75 near Monroe, MI	I-96, I-696 & M-5 in Farmington Hills	1977	current
I-375	1.06	1.71	BS I-375 in Detroit, MI	I-75 in Detroit, MI	1964	current
I-475	16.99	27.34	I-75 near Grand Blanc, MI	I-75/US 23 near Mount Morris, MI	1973	current	Runs east and north of Flint, MI
I-675	7.72	12.42	I-75/US 23 near Saginaw, MI	I-75/US 23 near Zilwaukee, MI	1971	current
I-475	20.37	32.78	I-75 in Perrysburg	I-75 in Toledo	1964	current
I-675	26.53	42.70	I-75 near Miamisburg	I-70 near Medway	1987	current
I-275	2.98	4.80	I-40 in Knoxville	I-75/I-640 in Knoxville	1982	current
I-676	6.90	11.10	I-76/US 30 in Philadelphia	I-76 in Camden, NJ	1991	current
I-176	11.33	18.23	I-76/Penna Tpk. in Morgantown	US 422 near Reading	1964	current
I-276	32.65	52.55	I-76 in King of Prussia	Delaware River bridge (Pennsylvania-NJ state line)(current) I-95/I-295 in Bristol Township (future)	1964	current
I-376	78.70	126.66	I-80 near Hermitage	I-76/US 22 in Monroeville	1972	current
I-476	129.61	208.59	I-95 near Chester, PA	I-81 near Clarks Summit, PA	1992	current	Longest Auxiliary Interstate in the country
I-576	—	—	—	—	proposed	—	Proposed Southern Beltway route from Pittsburgh International Airport to I-376
I‑277	4.46	7.18	Beltway around uptown Charlotte, NC		1981	current
I-277	4.14	6.66	I-76 in Akron	I-77 in Akron	1970	current
I-278	35.62	57.32	US 1/9 in Linden, New Jersey	Bruckner Interchange in Bronx, New York	1961	current
I-478	2.14	3.44	I-278 in Brooklyn, New York	NY 9A in Manhattan, New York	1971	current	Unsigned
I-678	14.33	23.06	John F. Kennedy International Airport in Queens, New York	Bruckner Interchange in Bronx, New York	1965	current
I-878	0.70	1.13	I-678 in Queens, New York near JFK Airport	JFK Expressway in Queens, New York near JFK Airport	1970	current	Unsigned
I-279	13.32	21.44	I-376/US 22/US 30 in Pittsburgh	I-79 in Franklin Park	1972	current
I-579	1.57	2.53	PA 885 in Pittsburgh	I-279/PA 28 in Pittsburgh	1962	current
I-180	—	—	US 101 in San Rafael	I-80 near Berkeley	1978	1991	Temporary designation of what was formerly part of SR 17, now part of I-580.
I-280	57.22	92.09	I-680/US 101 in San Jose	King Street in San Francisco	1964	current
I-380	1.671	2.689	I-280 in San Bruno	US 101	1964	current
I-480	—	—	I-80 in San Francisco	Sansome Street in San Francisco	1957	1968	Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
I-580	75.63	121.71	US 101 in San Rafael	I-5 near Westley	1964	current	Segments were originally part of I-5W
I-680	70.52	113.49	I-280/US 101 in San Jose	I-80 in Cordelia	1955	current	Originally SR 21
I-780	6.50	10.46	I-80 in Vallejo	I-680 in Benicia	1955	current	Originally part of I-680
I-880	47.22	75.99	I-280/SR 17 in San Jose	I-80/I-580 in Oakland	1983	current	Originally part of SR 17
I-980	2.03	3.27	I-880 in Downtown Oakland	I-580/SR 24 in Oakland	1981	current
I‑580	30.09	48.43	US 50 in Carson City	I-80 in Reno	2012	current	Runs concurrently with US 395
I-180	13.19	21.23	IL 26/IL 71 in Hennepin, Illinois	I-80 near Princeton, Illinois	1969	current
I-280	26.98	43.42	I-80 near Davenport, IA	I-74/I-80 near Colona, IL	1990	current
I-380	73.05	117.56	I-80 near Iowa City	US 218 in Waterloo	1985	current	Connects Cedar Rapids with I-80
I-480	4.90	7.89	I-80/US 75 in Omaha, NE	I-29/US 6 in Council Bluffs, IA	1966	current
I-680	42.86	68.98	I-80 in Omaha, NE	I-80 near Neola, IA	1966	current
I-180	3.18	5.12	US 34 (9th St. / 10th St.) in Lincoln	I-80 / US 34 / US 77 in Lincoln	1964	current
I-580	1.60	2.57	I-480 in Omaha	Lake Street in Omaha	1976	1982	Now part of US 75
I-280	17.85	28.73	I-80 in Parsippany-Troy Hills	I-95/NJ Tpk. in Kearny	1958	current
I-280	12.41	19.97	I-75 in Toledo, OH	I-80/I-90/Ohio Tpk. in Lake Township, OH	1959	current
I-480	41.77	67.22	I-80/Ohio Tpk. in North Ridgeville, OH	I-80/Ohio Tpk. in Streetsboro, OH	1971	current
I-680	16.43	26.44	I-76/Ohio Tpk. in North Lima, OH	I-80/SR 11 near Mineral Ridge, OH	1964	current
I-180	28.85	46.43	US 15/US 220 in Williamsport, PA	I-80/PA 147 near Milton, PA	1984	current
I-380	24.76	39.85	I-80 in Tunkhannock Township. PA	I-81/I-84/US 6 in Dunmore, PA	1973	current
I-180	1.09	1.75	I-80 in Cheyenne, WY	I-80 Bus/US 30 in Cheyenne, WY	1984	current	Not built to Interstate Highway standards
I-481	15.04	24.20	I-81 in Onondaga, NY	I-81/NY 481 in North Syracuse	1970	current
I-781	4.30	6.92	I-81 in Pamelia, NY	Fort Drum main gate in Le Ray, NY	2012	current
I‑381	1.67	2.69	SR 381 in Bristol	I-81 in Bristol	1961	current
I‑581	6.64	10.69	US 220/SR 24 in Roanoke	I-81 near Hollins	1950	current
I‑182	15.19	24.45	I-82/US 12 near Richland	US 12/US 395 in Pasco	1986	current
I-283	2.91	4.68	I-76/Penna Tpk. near Highspire	I-83/US 322/Capital Beltway near Harrisburg	1972	current
I-384	8.20	13.20	I-84/US 6 in East Hartford	US 6/US 44 in Bolton	1984	current
I-684	28.47	45.82	I-287 near White Plains, NY	NY 22 near Brewster, NY	1974	current	Also crosses into Connecticut
I-184	3.62	5.83	I-84 in Boise, ID	US 20/US 26	1990	current
I‑685	14.00	22.53	I-65 in downtown Montgomery, AL	I-85 in Montgomery, AL	proposed	—
I‑185	49.30	79.34	US 27/US 280/SR 520 in Columbus	I-85 near LaGrange	1979	current
I‑285	63.98	102.97	Beltway around Atlanta, GA		1969	current
I‑985	24.04	38.69	I-85 near Buford, GA	SR 369 near Gainesville	1985	current
I‑285	—	—	I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC	I-40/US 52/US 311/NC 8 in Winston-Salem, NC	proposed	—
I‑485	66.68	107.31	Beltway around Charlotte, NC		1988	current
I‑785	2.21	3.56	I-40/I-85/I-840/I-85 Bus. in Greensboro, NC	US 70 in Greensboro, NC	2013	current
I-185	17.70	28.49	I-385 near Mauldin, SC	US 29 in Greenville, SC	1955	current
I-385	42.16	67.85	I-26 near Clinton, SC	US 276 in Greenville, SC	1962	current
I-585	2.25	3.62	US 176/US 221/SC 9 in Spartanburg, SC	I-85 Bus./US 176 near Spartanburg, SC	1962	current
I‑785	—	—	US 29/US 58/US 29 Bus. in Danville, VA	US 29/US 58/US 360/US 58 Bus. in Danville, VA	proposed	—
I-287	98.72	158.87	I-95/NJ Tpk. in Edison, NJ	I-95 in Rye, NY	1961	current
I-587	1.21	1.95	I-87/Thruway/NY 28 in Kingston, NY	NY 28/NY 32 in Kingston, NY	1960	current
I‑587	—	—	Future I 87 (current US 64) near Zebulon, NC	US 264 near Greenville, NC	proposed[14]	—
I-787	10.16	16.35	I-87/Thruway in Albany, NY	NY 7 in Green Island, NY	1968	current
I‑189	1.49	2.40	US 7 in South Burlington, VT	I-89 in South Burlington	1980	current
I-190	3.07	4.94	O'Hare International Airport in Chicago, IL	I-90 in Chicago, IL	1978	current
I-290	29.84	48.02	I-90/IL 53 in Rolling Meadows, IL	I-90/I-94 / Congress Parkway in Chicago, IL	1972	current
I‑190	19.26	31.00	I-290 in Worcester, MA	Route 2 in Leominster, MA	1983	current
I‑290	20.16	32.44	I-395 in Auburn, MA	I-495 in Marlborough, MA	1970	current
I-190	28.34	45.61	I-90/Thruway in Cheektowaga, NY	Highway 405 at Lewiston, NY	1959	current
I-290	9.80	15.77	I-190 in Tonawanda, NY	I-90/Thruway in Williamsville, NY	1964	current
I-390	76.06	122.41	I-86/NY 17 in Avoca, NY	I-490 in Gates, NY	1973	current
I-490	—	—	I-294	I-90	proposed[15]	—	Proposed route number for the O'Hare West Bypass
I-490	37.40	60.19	I-90/Thruway in Bergen, NY	I-90/Thruway in Victor, NY	1970	current
I-590	5.31	8.55	I-390 in Brighton, NY	I-490/NY 590 in Rochester, NY	1980	current
I-690	14.19	22.84	I-90/Thruway/NY 690 in Van Buren, NY	I-481 in East Syracuse, NY	1962	current
I-790	2.41	3.88	I-90/Thruway in Deerfield, NY	NY 5A/NY 55 in Utica, NY	1961	current
I-890	9.35	15.05	I-90/Thruway in Rotterdam, NY	I-90/Thruway in Guilderland, NY	1962	current
I-990	6.35	10.22	I-290 in Amherst, NY	NY 263 near Lockport, NY	1985	current	Highest numbered Interstate in the Interstate system
I-490	2.43	3.91	I-71/I-90 in Cleveland, OH	East 55th Street in Cleveland, OH	1990	current
I-190	1.72	2.77	I-90 in Rapid City, SD	US 16 in Rapid City, SD	1962	current
I-291	6.02	9.69	I-91 in Windsor, CT	I-84 in Manchester, CT	1994	current
I-691	8.38	13.49	I-84 at the Southington-Cheshire town line, CT	I-91 in Meriden, CT	1988	current
I‑291	5.44	8.75	I-91 in Springfield, MA	I-90/Mass Pike in Chicopee, MA	1972	current
I‑391	4.46	7.18	I-91 in Chicopee, MA	High Street in Holyoke, MA	1970	current
I‑293	11.18	17.99	I-93/NH 101 in Manchester, NH	I-93/Everett Tpke in Hooksett, NH	2008	current
I‑393	4.60	7.40	I-93 in Concord, NH	NH 9 in Pembroke, NH	1979	current
I-294	53.42	85.97	I-80/I-94 in South Holland, Illinois	I-94 in Deerfield, Illinois	1968	current
I-194	3.38	5.44	I-94 in Battle Creek. MI	M-66 in Battle Creek, MI	1961	current
I-394	9.75	15.69	I-494/US 12 in Minnetonka, MN	4th Street in Minneapolis, MN	1991	current
I-494	42.94	69.11	I-94/I-694 in Maple Grove, MN	I-94/I-694 in Woodbury, MN	1985	current	Western and southern half of the Minneapolis–St. Paul beltway
I-694	22.62	36.40	I-94/I-494 in Maple Grove, MN	I-94/I-494 in Woodbury, MN	1970	current	Northern and eastern half of the Minneapolis–St. Paul beltway
I-194	1.20	1.93	McKenzie Drive near Bismarck, ND	I-94 near Mandan, ND	—	—	Unsigned
I-794	3.75	6.04	I-43/I-94 in Milwaukee, WI	WIS 794 in Milwaukee, WI	1980	current
I-894	4.70	7.56	I-94 in Milwaukee, WI	I-43/I-94 in Milwaukee, WI	1966	current
I-395	54.69	88.02	I-95 in East Lyme, CT	I-290 in Auburn, MA	1983	current
I‑295	73.77	118.72	I-95/I-495 in New Castle, DE	I-95/US 1 in Lawrence Township, NJ	1994	current
I‑495	11.47	18.46	I-95/I-295 in Newport, DE	I-95 in Claymont, DE	1977	current
I‑295	6.00	9.66	I-95/I-495 near Forest Heights, MD	I-695 in Washington, DC	1964	current
I‑395	13.39	21.55	I-95/I-495 in Springfield, VA	US 50 in Washington, DC	1977	current	Original route of I-95 that was proposed to continue through Washington, DC
I‑495	31.41	50.55	Beltway around Washington, DC		1961	current	Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
I‑695	2.00	3.22	I-395 in Washington, DC	I-295 in Washington, DC[16]	1958	current
I-195	4.42	7.11	I-95/SR 112 in Miami, FL	SR 905 in Miami Beach, FL	1961	current
I-295	61.04	98.23	Beltway around Jacksonville		1970	current
I-395	1.29	2.08	I-95	MacArthur Causeway at Watson Island, Miami, FL	1971	current
I-595	12.86	20.70	I-75/SR 869 in Weston, FL	US 1 in Fort Lauderdale, FL	1990	current
I-795	—	—	Interstate 95 south of Jacksonville	I-295 in Jacksonville	proposed	—	Currently under construction; partially open as SR 9B but not yet signed as I-795
I‑195	1.55	2.49	I-95/Maine Tpk. in Saco, ME	SR 5 in Saco, ME	1980	current
I‑295	53.11	85.47	I-95/Maine Tpk. in Scarborough, ME	I-95/Maine Tpk. in Gardiner, ME	1960	current
I‑395	4.99	8.03	I-95/US 2/SR 100 in Bangor, ME	US 1A in Brewer, ME	2008	current
I‑495	3.70	5.95	I-95/Maine Tpk. in Portland, ME	I-295/US 1 in Falmouth, ME	2004	current	Unsigned
I-195	4.71[17]	7.58	I-95/MD 166 near Catonsville, MD	Baltimore-Washington International Airport	1990	current
I-395	1.98	3.19	I-95 in South Baltimore, MD	West Pratt Street in Baltimore, MD	1981	current
I-595	19.97	32.14	I-95/I-495/US 50 near Washington, DC	US 50/US 301/MD 70 in Annapolis, MD	2011	current	Unsigned designation for US 50
I-695	30.57	49.20	Beltway around Baltimore		1958	current
I-795	8.99	14.47	I-695 in Pikesville, MD	MD 140 in Reisterstown, MD	1985	current
I-895	11.44	18.41	I-95 near Elkridge, MD	I-95 in Baltimore, MD	1979	current
I‑295	8.05	12.96	I-95/I-495 near Forest Heights, MD	I-695 in Washington, DC	1964	current
I‑195	44.55	71.70	I-95 in Providence, RI	I-495/Route 25 in Wareham, MA	1958	current
I‑295	26.58	42.78	I-95 in Warwick, RI	I-95 in Attleboro, MA	1969	current
I‑495	121.56	195.63	I-195/Route 25 in Wareham, MA	I-95 in Salisbury, MA	1957	current
I‑695	—	—	I-93 in Roxbury, Boston	I-93 in Charlestown, Boston	1955	1971	Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
I-195	34.17	54.99	I-295 in Hamilton Township, NJ	Route 34 in Wall Township, NJ	1968	current
I-295	7.70	12.39	Hillside Avenue (NY 25)/NY 24 in Queens, NY	Bruckner Interchange in the Bronx, NY	1970	current
I-495	66.38	106.83	Queens Midtown Tunnel in Manhattan, NY	CR 58 in Riverhead, NY	1958	current
I-695	1.40	2.25	I-95 in the Bronx, NY	I-295 in the Bronx, NY	1986	current
I-895	1.12	1.80	I-278 in the Bronx, NY	I-95 in the Bronx, NY	1970	current
I‑295	—	—	—	—	proposed	—	Planned route around the west side of Fayetteville, NC
I‑495	4.10	6.60	I-440/US 64/US 64 Bus in Raleigh, NC	I-540/US 64/US 264 in Knightdale, NC	2013	current
I‑795	25.46	40.97	US 70/US 117 in Goldsboro, NC	I-95/US 264 in Wilson, NC	2007	current
I‑195	3.24	5.21	SR 195 in Richmond, VA	I-64/I-95 in Richmond, VA	1970	current
I‑295	52.56	84.59	I-95 near Petersburg, VA	I-64 near Short Pump, VA	1980	current
I-196	37.07[11]	59.66	US 31 in Norton Shores, MI	I-96/US 16 in Grand Rapids, MI	1959	1963	Now the western end of I-96
I-196	80.65	129.79	I-94/US 31 near Benton Harbor, MI	I-96/M-37 in Grand Rapids, MI	1963	current
I-296	3.43	5.52	I-196 in Grand Rapids, MI	I-96/M-37 in Walker, MI	1962	current	Unsigned since 1979
I-496	11.78	18.96	I-69/I-96 near Lansing, MI	I-96 and US 127 near Lansing, MI	1970	current
I-696	29.39	47.30	I-96/I-275 & M-5 in Novi, MI	I-94 in Roseville, MI	1989	current
Former       Future

See also

• U.S. Roads portal

Notes

1. According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.^[3] MDOT and most major map publishers do count the overlap.^[11][12][13]

References

1. Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
2. DeSimone, Tony (October 31, 2002). "FHWA Route Log and Finder List: Interstate Route Numbering". Federal Highway Administration. Retrieved February 3, 2008.
3. Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.
4. Tabb, John R. (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Phoenix, AZ: American Association of State Highway and Transportation Officials.
5. Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.
6. Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
7. Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007. Retrieved July 17, 2007.
8. Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Archived from the original on July 17, 2007. Retrieved July 8, 2007.
9. Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF) (Letter). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.
10. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
    • Montgomery County (PDF)
11. Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved February 6, 2016.
12. Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.
13. Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.
14. "State Seeking Future Interstate Designation for U.S. 264 to Greenville". North Carolina Governor's Office. Retrieved 10 November 2016.
16. Mike DeBonis (28 November 2011). "Interstate 695 reappears in D.C.". Washington Post.
17. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
    • Anne Arundel County (PDF) pp. 6–7
    • Baltimore County (PDF) pp. 18–20, 162

External links

• 3-digit Interstates at Kurumi.com