The auxiliary Interstate Highways (also called 3-digit Interstate Highways) is an additional network of freeways of the Interstate Highway System. Similar to the primary Interstate Highways, they also meet Interstate Standards, receive the same substantial federal funding, and comply with other federal standards. The main purpose of the auxiliary Interstate Highways is to serve large cities and suburbs and provide a supplement to the main Interstate Highways throughout the United States. There are also planned out to spare the availability of mainline 2-digit routes since some routes like I-196 are more of a substitute of a mainline 2-digit Interstate, I-196's parent I-96 itself is a mainline intrastate interstate.

In contrast to the primary Interstate Highways, the three-digit highways often run only within or around a single metropolitan city. In addition, they are generally shorter, and many do not cross state borders, despite the term "Interstate". Due to the large number of these routes, auxiliary route numbers may be repeated in different states along the mainline. However, no two three-digit Interstates in the same state can share the same number, unless 2 segments form a gap of a long route that is meant to be complete, such as I-696 which had urban complications in Michigan, although an instance like this is a spiritual exception to the rule.

Terminology and guidelines

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 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 indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 supplements to I-15.

Spur route

A spur route usually represents 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 or substandard freeway.
• It may represent the first portion of an extended freeway, that downgrades to below Interstate standards with plans to upgrade (such as I-540 in Arkansas).
• It may connect two unrelated Interstate highways (such as I-390 in New York).

A spur route is preceded by an odd number in the first digit.

• Examples of spur routes are listed below.

I-110 in California links Interstate 10 to the Port of Los Angeles.

I-180 in Nebraska makes its way through Lincoln.

Sometimes, a three-digit highway branches off another three-digit highway; this is called a tertiary spur route of a two-digit highway. Tertiary spurs do not meet their parent highways, but are associated with them via the three-digit highways they do meet.

• Examples of tertiary spur routes are listed below.

I-370 in Maryland branches off I-270, and is thus a tertiary spur of I-70.

I-380 in California is located at the San Francisco Bay Area; the route begins at I-280 and never connects to its parent I-80.

I-990 in New York is located near Buffalo, NY; the route begins at I-290 and never connects to its parent I-90.

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.

• Examples of bypass routes are listed below.

I-215 in Utah travels the perimeter of Salt Lake City.

I-895 in Maryland serves as a bypass of downtown Baltimore.

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. Beltways are also preceded by an even number in the first digit.

• Examples of beltways are listed below.

I-465 in Indiana travels around the city of Indianapolis.

I-285 in Georgia encircles the city of Atlanta.

I-275 in Ohio, Kentucky and Indiana travels around the city of Cincinnati.

Exceptions

• New York City has numerous spur routes from I-78 and I-95, but none of I-78's spur routes actually intersects with I-78. This is because I-78 was originally planned to continue east from its present terminus at the Holland Tunnel across Lower Manhattan, through Queens and across Long Island. This extension of I-78 was cancelled in the 1970s after I-278, I-478, I-678, and I-878 had already been established.
• In the New York City area, I-495 does not connect to I-95 directly (but does intersect I-295, which does). The connector from the New Jersey Turnpike to the Lincoln Tunnel was to have been part of I-495 despite not currently being up to interstate standards, but became NJ 495 due to the cross-Manhattan part not being built. The cross-Manhattan part was to have connected the Lincoln Tunnel to the Queens-Midtown Tunnel. I-495 currently runs from the Queens-Midtown Tunnel to a terminus near Riverhead, New York on Long Island. An extension from there, crossing Long Island Sound to I-95 in Connecticut, was never built.
• An auxiliary route numbered I-238 connects San Leandro and Castro Valley, California, yet there is no I-38. Instead, I-238 carries the designation of the portion of State Route 238 that the Interstate designation replaced. I-238 could have been an auxiliary route of I-80, but at the time of I-238's designation, all auxiliary routes of I-80 (I-280 through I-980; I-180 was not used because of a Caltrans policy forbidding number duplications and the prior existence of State Route 180) were already designated in California.

Auxiliary Interstates

Below is a list of auxiliary Interstate Highway designations in the United States. They are sorted in the following order:

1. numerically by the primary Interstate Highway (one or two digits)
2. alphabetically by the state of the auxiliary Interstate
3. numerically by the auxiliary Interstate itself

:	H-1 I-5 I-10 I-15 I-16 I-20 I-24 I-25 I-26 I-29 I-30 I-35 I-38 I-40 I-44 I-45 I-55 I-59 I-64 I-65 I-66 I-69 I-70 I-71 I-72 I-74 I-75 I-76 I-77 I-78 I-79 I-80 I-81 I-82 I-83 I-84 I-84 I-85 I-86 I-87 I-89 I-90 I-91 I-93 I-94 I-95 I-96

Legend
Existing route	Unsigned route	Future route

Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate H-1
Hawaii
		in Halawa	in Honolulu
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 5
California
		in El Segundo	in Norwalk
		near Tracy	near Tracy
		in West Sacramento	in Sacramento
		in Irvine	in Mission Hills
		in Vacaville	in Dunnigan
		in Seal Beach	in Irwindale
		in San Diego	in San Ysidro
	Proposed auxiliary route to connect to the Mexican border in the San Diego area
Oregon
		in Eugene	in Springfield
		in Portland	in Portland
Oregon-Washington
		in Tualatin, OR	in Salmon Creek, WA
Washington
		in Tukwila	in Lynnwood
I-605	Proposed to bypass Seattle
		in Tacoma	Schuster Parkway in Tacoma
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 10
California
		in San Pedro, Los Angeles	in Los Angeles
		in Sylmar	in Glendora
		Terminal Island in Long Beach	Valley Boulevard in Alhambra
Florida
		near Pensacola	near Pensacola
Louisiana
		in Baton Rouge	in Baton Rouge
		near Sulphur	in Lake Charles
		in Boutte	near Kenner
		LA 47 in New Orleans	I-10 in New Orleans
		at the Orleans-Jefferson Parish	in New Orleans
		in Marrero	in New Orleans
Mississippi
		in Biloxi	in D'Iberville
Texas
		United States-Mexico border in El Paso	in El Paso
		Beltway around San Antonio
		Beltway around Houston
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 15
California
		in Murrieta	in Devore
Montana
		in Butte	Iron Street in Butte
		in Great Falls	Great Falls
Nevada
		near Paradise	in Henderson
		in Henderson	in Las Vegas
Utah
		in Salt Lake City	in North Salt Lake
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 16
Georgia
		in Savannah	in Garden City
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 20
Georgia-South Carolina
		in Augusta, GA	in North Augusta, SC
Louisiana
		in Shreveport	in Bossier City
Mississippi
		in Jackson	in Ridgeland
Texas
		Beltway around Fort Worth
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 24
Tennessee
		in Chattanooga	in Chattanooga
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 25
Colorado
		in Denver	in Aurora
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 26
South Carolina
		in Columbia	in Columbia
		in Mount Pleasant	in Charleston
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 29
Iowa-Nebraska
		in South Sioux City, NE	in Sioux City, IA
Missouri
		in St. Joseph	in St. Joseph
South Dakota
		in Sioux Falls	near Sioux Falls
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 30
Arkansas
	Proposed route in Texarkana
		in Little Rock	in Little Rock
		in Pine Bluff	in Little Rock
		near Little Rock	in Little Rock
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 35
Iowa
		in West Des Moines	near Des Moines
Kansas
		in Wichita	in Salina
		in Wichita	in Wichita
		in Emporia	in Topeka
Kansas-Missouri
		Beltway around Kansas City, KS and Kansas City, MO
		in Overland Park, KS	in Kansas City, MO
Minnesota-Wisconsin
		in Duluth, MN	in Superior, WI
Oklahoma
		in Oklahoma City	in Oklahoma City
Texas
		in Grapevine	in Balch Springs
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 38?
California
	2.16 mi (3.48 km)	in Castro Valley	in San Leandro
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 40
Arkansas
		near Little Rock	near Little Rock
		near Fort Smith	in Bentonville
North Carolina
	27 mi (44 km)	near Navassa	near Ogden
	9.14 mi (14.71 km)	near Asheville	in eastern Asheville
		near Cary	near Raleigh
	26 mi (42 km)	near Durham	near Knightdale
	Future part of the Greensboro Urban Loop
Oklahoma
		in Oklahoma City	in Oklahoma City
Tennessee
		near Farragut	near Alcoa
	19.27 mi (31.01 km)	in Memphis	in Memphis
	8 mi (13 km)	in Nashville	in Nashville
	7.03 mi (11 km)	in Knoxville	in Knoxville
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 44
Oklahoma
		in Tulsa	in Tulsa
		in Tulsa	in Tulsa
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 45
Texas
		in Dallas	in Dallas
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 55
Arkansas
		I-55 in Turrell	AR 91 in Jonesboro
Illinois
		in Morton	in Lincoln
	32.51 mi (52.67 km)	in New Lenox	in Itasca
Illinois-Missouri
	30.82 mi (49.90 km)	in Mehlville, MO	in Pontoon Beach, IL
Missouri-Tennessee
	26.77 mi (43.08 km)	near Hayti, MO	at Dyersburg, TN
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 59
Alabama
		in southern Tuscaloosa	15th Street in downtown Tuscaloosa
		in Bessemer	in Trussville
		in Attalla	in Gadsden
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 64
Indiana
		in Evansville	in Evansville
Kentucky
		in Louisville	in Louisville
Virginia
		in Chesapeake	King Street in Oceanfront
		in Chesapeake	in Norfolk
			in Norfolk
		in Chesapeake	in Hampton
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 65
Alabama
		in Mobile	in Mobile
		in Decatur	in Huntsville
Indiana
		in New Albany
		Beltway around Indianapolis
		near Indianapolis	near Indianapolis
Kentucky
		in Louisville	in Louisville
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 69
Indiana
		in Fort Wayne	in Fort Wayne
Mississippi-Tennessee
	Memphis, TN outer beltline, currently under construction.
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 70
Colorado
		at Welby	at Denver
Missouri
		in Richmond Heights	in Hazelwood
		in Kansas City	in Independence
Illinois-Missouri
		Missouri border on the Mississippi River	near Troy
Kansas
		in Topeka	in Topeka
Kansas-Missouri
		in Kansas City, KS	in Kansas City, MO
Maryland
		near Frederick	north of Bethesda
		in Gaithersburg	Shady Grove Metro Station
Missouri
		in Green Park, MO	Illinois border on the Mississippi River
		in Kansas City	in Independence, Missouri
Ohio
		Beltway around Columbus
		in Columbus	on the east side of Columbus, near Port Columbus International Airport, Easton Town Center, and Gahanna.
Ohio-West Virginia
		near Blaine, OH	in Elm Grove, WV
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 71
Kentucky-Ohio
		in Newport	in Newport
Ohio
		in Cleveland	in Cleveland
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 72
Illinois
		in Quincy	in Quincy
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 74
Illinois
		in Peoria	in Morton
North Carolina
	Proposed route in Winston-Salem
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 75
Florida
		in St. Petersburg	in St. Petersburg
		in Tampa Bay Area	in Tampa Bay Area
		in St. Petersburg	in St. Petersburg
Georgia
		in Macon	in Macon
		in Atlanta	west of Nelson
	11.04 mi (17.77 km)	in Stockbridge	southeast of Atlanta
Indiana-Kentucky-Ohio
	83.71 mi (134.72 km)	Beltway around Cincinnati, OH
Michigan
	35.01 mi (56.34 km)	near Monroe	in Farmington Hills
	1.06 mi (1.71 km)	Greenspur 375 to Civic Center	in Detorit
	16.99 mi (27.34 km)	in Grand Blanc Charter Township	in Mount Morris Charter Township
	7.73 mi (12.44 km)	in Buena Vista Charter Township	in Kochville Township
Ohio
	20.37 mi (33 km)	in Perrysburg	in Toledo
	26.53 mi (43 km)	near Miamisburg	near Medway
Tennessee
	2.98 mi (5 km)	in Knoxville	in Knoxville
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 76
Pennsylvania
	11.33 mi (18.23 km)	in Morgantown	near Reading
	32.65 mi (52.55 km)	in King of Prussia	Ext. in Bristol Township (current) in Bensalem (future)
	14.70 mi (23.66 km)	in Pittsburgh	in Monroeville
	132.10 mi (212.59 km)	near Chester	near Clarks Summit
	Proposed Southern Beltway route from Pittsburgh International Airport to
	6.90 mi (11.1 km)	in Philadelphia	in Camden, NJ
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 77
Ohio
	4.14 mi (6.66 km)	in Akron	in Akron
North Carolina
	4.41 mi (7.10 km)	Beltway around uptown Charlotte, North Carolina
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 78
New York
	35.6 mi (57.3 km)	in Linden, NJ	Bruckner Interchange in Bronx, New York City
	2.14 mi (3.44 km)	in Brooklyn, New York City	in Manhattan, New York City
	14 mi (23 km)	John F. Kennedy International Airport in Queens, New York City	Bruckner Interchange in Bronx, New York City
	5.69 mi (9.16 km)	in Queens, New York City	Atlantic Beach Bridge in Lawrence
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 79
Pennsylvania
		near Pittsburgh	in Franklin Township
		in Pittsburgh	in Pittsburgh
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 80
California
		in San Jose	King Street in San Francisco
		in San Bruno
		in San Rafael	near Westley
	71 mi (114 km)	in San Jose	in Cordelia
	6.52 mi (10.49 km)	in Vallejo	in Benicia
	45 mi (72 km)	in San Jose	in Oakland
	2.02 mi (3.25 km)	in Downtown Oakland	in Oakland
Illinois
	13.19 mi (21.22 km)	in Hennepin, Illinois	near Princeton, Illinois
Illinois-Iowa
	26.98 mi (43.42 km)	near Davenport, IA	near Colona, IL
Iowa
	73.05 mi (117.56 km)	near Iowa City	in Waterloo
Iowa-Nebraska
	4.90 mi (7.89 km)	in Omaha, NE	in Council Bluffs, IA
	42.86 mi (68.98 km)	in Omaha, NE	near Neola, IA
Nebraska
	3.47 mi (5.58 km)	in Lincoln	in Lincoln
Nevada
	4.99 mi (8.03 km)	Neil Road in Reno	in Reno
New Jersey
	17.85 mi (28.73 km)	in Parsippany-Troy Hills	in Kearny
Ohio
	12.41 mi (19.97 km)	in Toledo	in Lake Township
	41.77 mi (67.22 km)	near North Ridgeville	near Streetsboro
	16.43 mi (26.44 km)	in North Lima,	near Mineral Ridge,
Pennsylvania
	28.85 mi (46.43 km)	in Williamsport	near Milford
	24.76 mi (39.85 km)	in Tunkhannock Township	in Dunmore
Wyoming
	1.09 mi (1.75 km)	in Cheyenne	/Bus I-80
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 81
New York
	15.04 mi (24.2 km)	in Onondaga	in North Syracuse
Virginia
	1.70 mi (2.74 km)	in Bristol	in Bristol
	6.35 mi (10.22 km)	in Roanoke	near Hollins
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 82
Washington
	15.19 mi (24.45 km)	near Richland	in Pasco
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 83
Pennsylvania
	2.91 mi (4.683 km)	near Highspire	/Capital Beltway near Harrisburg
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 84
Connecticut
	8.53 mi (13.73 km)	in East Hartford	in Bolton
New York/Connecticut
	28.4 mi (45.7 km)	near White Plains	near Brewster
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 84
Idaho
	3.62 mi (6.00 km)	in Boise
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 85
Georgia
	49.30 mi (79.34 km)	in Columbus	near LaGrange
	63.98 mi (102.97 km)	Beltway around Atlanta
	24.04 mi (38.69 km)	I-85 near Buford	SR 369 near Gainesville
North Carolina
	23 mi (37 km)	in Winston-Salem	in Lexington
	62 mi (99.78 km)	in Huntersville	in Charlotte
North Carolina-Virginia
	45 mi (72.42 km)	in Greensboro, NC	in Danville, VA
South Carolina
	17.70 mi (28.49 km)	near Mauldin
	42.16 mi (67.85 km)	near Clinton	in Greenvile
	2.25 mi (3.62 km)	in Spartanburg	near Spartanburg
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 87
New Jersey-New York
	98.65 mi (158.73 km)	in Edison, NJ	in Rye, NY
New York
	1.21 mi (1.95 km)	in Kingston	in Kingston
	9.55 mi (15.37 km)	in Albany	in Green Island
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 89
Vermont
	1.49 mi (2.4 km)	in South Burlington	in South Burlington
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 90
Illinois
	3.07 mi (5 km)	O'Hare International Airport in Chicago	in Chicago
	29.84 mi (48.02 km)	in Rolling Meadows	/Congress Parkway in Chicago
Massachusetts
	19.26 mi (31 km)	in Worcester	in Leominster
	20.16 mi (32.44 km)	Mass Pike in Auburn	in Marlborough
New York
	28.34 mi (45.61 km)	in Cheektowaga	in Lewiston
	9.80 mi (15.77 km)	in Tonawanda	in Williamsville
	75.86 mi (122.08 km)	in Avoca	in Gates
	37.40 mi (60.19 km)	in Bergen	in Victor
	5.07 mi (8.16 km)	in Brighton	in Rochester
	14.19 mi (22.84 km)	in Van Buren	in East Syracuse
	2.41 mi (4 km)	in Deerfield	in Utica
	9.45 mi (15.21 km)	in Rotterdam	in Guilderland
	6.35 mi (10.22 km)	in Amherst	near Lockport
Ohio
	2.43 mi (4 km)	in Cleveland	55th Street East in Cleveland
South Dakota
	2 mi (3 km)	in Rapid City	in Rapid City
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 91
Connecticut
	6.40 mi (10.3 km)	in Windsor	in Manchester
	8.92 mi (14.36 km)	at the Southington-Cheshire Town Line	in Meriden
Massachusetts
	5.44 mi[1] (8.75 km)	in Springfield	Mass Pike in Chicopee
	4.86 mi (7.82 km)	in Chicopee	High Street in Holyoke
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 93
New Hampshire
	11.43 mi (18.39 km)	in Manchester	Everett Turnpike in Hooksett
	4.50 mi (7.24 km)	in Concord	in Pembroke
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 94
Illinois
	53.42 mi (85.97 km)	in South Holland, Illinois	in Deerfield, Illinois
Michigan
	3.42 mi (5.5 km)	in Battle Creek	in Battle Creek
Minnesota
	9.50 mi (15.30 km)	in Minnetonka	4th Street in Minneapolis
	43 mi (69 km)	in Maple Grove	in Woodbury
	31 mi (50 km)	in Maple Grove	in Woodbury
North Dakota
	1.7 mi (2.7 km)	McKenzie Drive near Bismarck	near Mandan
Wisconsin
	3.75 mi (6.04 km)	in Milwaukee	in Milwaukee
	9.30 mi (14.97 km)	in Milwaukee	in Milwaukee
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 95
Connecticut-Massachusetts
	66.63 mi (107.23 km)	in East Lyme, CT	in Auburn, MA
Delaware
	11.47 mi (18.46 km)	in Newport	in Claymont
Delaware-New Jersey
	73.50 mi (118.29 km)	in New Castle, DE	in Lawrence Township (current) in Hamilton Township (future)
District of Columbia
	1.39 mi (2.24 km)	in Washington	Pennsylvania Avenue in Washington
Florida
	4.91 mi (7.90 km)	in Miami	in Miami Beach
	35.51 mi (57.15 km)	in Jacksonville	in Jacksonville
	1.12 mi (2 km)		MacArthur Causeway in Watson Island
	13 mi (20 km)	in Weston	in Fort Lauderdale
	Proposed route south of Jacksonville
Maine
	1.55 mi (2.49 km)	in Saco	in Saco
	52 mi (84 km)	in Scarborough	in Gardiner
	4.99 mi (8.03 km)	in Bangor	in Brewer
	3.7 mi (6 km)	in Portland	in Falmouth
Maryland
	4.88 mi (7.85 km)	near Catonsville	Baltimore-Washington International Airport
	1.98 mi (3.19 km)	in South Baltimore	West Pratt Street in Baltimore
	19.97 mi (32 km)	near Washington, DC	in Annapolis
	51.46 mi (82.82 km)	Beltway around Baltimore
	8.99 mi (14.47 km)	in Pikesville	in Reisterstown
	11.44 mi (18.41 km)	near Elkridge	in Baltimore
Maryland-District of Columbia
	8.05 mi (12.96 km)	near Forest Heights, MD	in Washington, DC
Maryland-District of Columbia-Virginia
	64.0 mi (103 km)	Beltway around Washington, DC
Massachusetts
	120.74 mi (194.31 km)	in Wareham	in Salisbury
New Jersey-Pennsylvania
	34.17 mi (54.99 km)	in Hamilton Township (current) in Bensalem Township, Pennsylvania (future)	in Wall Township
New York
	9.10 mi (14.65 km)	in Queens, New York City	Bruckner Interchange in Bronx, New York City
	71.02 mi (114.3 km)	Queens Midtown Tunnel in Manhattan, New York City	in Riverhead
	1.3 mi (2.1 km)	in Bronx, New York City	in Bronx, New York City
	1.12 mi (1.8 km)	in Bronx, New York City	in Bronx, New York City
North Carolina
	Planned route around the west side of Fayetteville
	25.41 mi (40.9 km)	in Goldsboro, NC	in Wilson, NC
Rhode Island-Massachusetts
	40.1 mi (64.5 km)	in Providence, RI	in Wareham, MA
	26.58 mi (42.78 km)	in Warwick, RI	in Attleboro, MA
Virginia
	3.50 mi (5.63 km)	in Richmond	in Richmond
	52.75 mi (84.89 km)	near Petersburg	near Short Pump
Virginia-District of Columbia
	13 mi (21 km)	in Springfield, VA	in Washington, DC
Interstate	Length	Southern/Western terminus	Northern/Eastern terminus
Interstate 96
Michigan
	81 mi (130.35 km)	in Benton Harbor	in Grand Rapids
	3.43 mi (5.52 km)	in Grand Rapids	in Walker
	11.78 mi (18.96 km)	in Lansing	in Lansing
	29.24 mi (47.04 km)	in Novi	in Roseville

See also

• List of proposed auxiliary Interstate Highways
• List of unsigned auxiliary Interstate Highways

References

1. x

External links

• 3-digit Interstates at Kurumi.com