List of auxiliary Interstate Highways

This is a list of auxiliary Interstate Highways of the Interstate Highway System in the United States.

List

Highway Shield	Designation	Miles (km)	State	Notes
	Interstate 404		Florida	Fictional. Eastern tolled bypass through Orlando. Carries FL 417.
	Interstate 105	17.32	California	Replaced parts of SR 42
	Interstate 105	3.49	Oregon	Concurrent with SR 126
	Interstate 205	12.97	California
	Interstate 205	36.64	Oregon
	Interstate 305	6	California	Unsigned
	Interstate 405	72.15	California	Bypass through western suburbs of Los Angeles.
	Interstate 405	3.53	Oregon
	Interstate 405	30.3	Washington	Bypass of Seattle, passes through Bellevue.
	Interstate 505	32.98	California	Originally Interstate 5W
	Interstate 605	27.4	California	Bypass through eastern Greater Los Angeles.
	Interstate 705	1.50	Washington	Schuster Parkway in Tacoma
	Interstate 805	28	California
	Interstate 110		California
	Interstate 110		Louisiana
	Interstate 110		Florida	Spur route into Pensacola in the Florida Panhandle.
	Interstate 110		Texas
	Interstate 110		Mississippi
	Interstate 210		California
	Interstate 210		Louisiana
	Interstate 310		Louisiana
	Interstate 410		Texas	Beltway around San Antonio.
	Interstate 510		Louisiana
	Interstate 610		Texas	Inner beltway around Houston.
	Interstate 610		Louisiana
	Interstate 710		California
	Interstate 910		Louisiana	Unsigned, signed as US 90 BUS
	Interstate 516		Georgia	Spur route through Savannah.
	Interstate 118		California	Fictional. Spur from Hylesville to Fresno.
	Interstate 518		California	Fictional. Spur from Modesto to Manteca. Parallels CA 99 directly.
	Interstate 520	23.34-mile (37.56 km)	GA/SC	3-quarter beltway around Augusta, Georgia and North Augusta, South Carolina.
	Interstate 221		Nevada	Fictional. Spur route into Las Vegas.
	Interstate 123		Utah	Fictional. Spur route through St. George.
	Interstate 238		California	There is no I-38, however AASHTO allowed Caltrans to number it 238.
	Interstate 248		California	Fictional. Bypass loop through Ooscondio. Also called the Ooscondio Loop.
	Interstate 248		Nevada and Utah	Fictional. Beltway around Highway City. Interstate Beltway in Intertropolis. U.S. Route Beltway in Routeville. Highway City Beltway in both locations.
	Interstate 165		Alabama	originally I-210
	Interstate 869		Indiana	Fictional
	Interstate 470		Colorado	Signed as E-470, tolled, partially completed beltway around Denver.
	Interstate 175		Florida	Sister highway to I-375 (below)
	Interstate 275		Florida	Major thoroughfare through Tampa and St. Petersburg.
	Interstate 375		Florida	Sister Highway to I-175 (above)
	Interstate 475		Georgia	Bypass through Macon.
	Interstate 575	30.95 (49.84)	Georgia	Spur through northwest Metro Atlanta. From Kennesaw to Nelson.
	Interstate 675	11.04 (17.77)	Georgia	Bypass southeast through Metro Atlanta. From Stockbridge to Forest Park.
	Interstate 376		OH/PA	Extended in 2009
	Interstate 476		Pennsylvania	Tolled, Pennsylvania Turnpike Northeast Extension
	Interstate 279		Pennsylvania
	Interstate 280		California
	Interstate 280	17.85 (28.73)	New Jersey
	Interstate 182		Washington
	Interstate 185	49.30 (79.34)	Georgia	Spur route into Columbus, Georgia in the western part of the state.
	Interstate 285	63.98 (102.97)	Georgia	Beltway around Atlanta.
	Interstate 985	25.01 (40.25)	Georgia	Spur through northeast Metro Atlanta. From Suwanee to Gainesville.
	Interstate 287		NJ/NY	part of New York State Thruway
	Interstate 787		New York
	Interstate 189		Vermont
	Interstate 190		New York
	Interstate 194		Michigan
	Interstate 195		Florida
	Interstate 195		New Jersey
	Interstate 195		Maine
	Interstate 295		Florida	Beltway around Jacksonville.
	Interstate 295		Virginia
	Interstate 295		MD/DC	Continues south as DC 295
	Interstate 295		DE/NJ/PA	Extended into Pennsylvania in 2018
	Interstate 295		New York
	Interstate 295		RI/MA	Partial beltway around Providence, RI
	Interstate 295		Maine	Passes through Portland.
	Interstate 395		Florida
	Interstate 395		Maine
	Interstate 495		MD/VA	Outer Beltway around District of Columbia. Colloquially known as Capital Beltway.
	Interstate 495		Maine	Unsigned highway. Known as Falmouth Spur.
	Interstate 595		Florida	Bypass through Miami.
	Interstate 695		District of Columbia	Originally unsigned, signed in 2011
	Interstate 695		Maryland	Full beltway around Baltimore
	Interstate 795		Florida	Currently under construction, signed as FL 9B
	Interstate 795		North Carolina	Originally US 117, northern terminus will overlap with I-587.

Interstate Highway System

Major Interstates are written in bold.