List of Interstate Highways in Pennsylvania

Interstate Highways of the Pennsylvania State Route System
Interstate Highways of the Pennsylvania State Route System
	; Route markers for Interstate 83, Interstate 376, Interstate 83 Business, and Interstate 376 Business
	Interstate Highways highlighted in red
System information
Notes	All routes are assigned State Route (SR X) numbers, usually corresponding to the signed numbers. Interstates are generally state-maintained.
Highway names
Interstates	Interstate X (I-X)
Business Loops:	Interstate X Business (I-X Bus.)
System links
	Pennsylvania State Route System ; Interstate ; US ; State ; Scenic ; Legislative ;

Last updated January 01, 2026

The list of Interstate Highways in Pennsylvania encompasses 23 Interstate Highways —12 primary routes and 11 auxiliary routes—which exist entirely or partially in the U.S. state of Pennsylvania. In Pennsylvania, most of the Interstate Highways are maintained by the Pennsylvania Department of Transportation (PennDOT). Some stretches are also maintained by the Pennsylvania Turnpike Commission, Delaware River Port Authority, the Delaware River Joint Toll Bridge Commission, and two short stretches maintained by the New York State Department of Transportation (these being the Delaware River bridge on Interstate 84 (I-84) and a short stretch of the future I-86 in Bradford County). Interstate Highways make up three percent of all roadway lane miles in Pennsylvania and have a combined length of 1,953 mi (3,143 km) within the state. Twenty-four percent of all vehicle traffic is on the Interstate System.^[1]

Primary Interstate Highways


Number	Length (mi)^[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-70	167.92	270.24	I-70 at West Virginia border in Donegal Township	I-70/US 522 at Maryland border near Warfordsburg	01956-01-011956	current
I-70S	36.7	59.1	I-70/I-79 in North Beaver Township	I-70/I-80S/Penna Turnpike in New Stanton	01957-01-011957	01964-01-011964	I-70S bypassed Pittsburgh to the south; I-70 rerouted to avoid Pittsburgh onto I-70S
I-76	349.67	562.74	I-76 at Ohio border in North Beaver Township	I-76 at New Jersey border in Philadelphia	01964-01-011964	current
I-78	75.23	121.07	I-81 in Union Township	I-78 at New Jersey border in Williams Township	01956-01-011956	current	Briefly designated as I-80N from 1957 to 1958^[3]
I-79	182.72	294.06	I-79 at West Virginia border in Perry Township	Bayfront Parkway in Erie	01956-01-011956	current	Called the Raymond P. Shafer Highway for its entire length^[3]
I-80	311.07	500.62	I-80 at Ohio border in Shenango Township	I-80 at New Jersey border in Delaware Water Gap	01956-01-011956	current
I-80S	349.67	562.74	I-80S at Ohio border in North Beaver Township	I-80S at New Jersey border in Philadelphia	01956-01-011956	01964-01-011964	Renumbered to I-76 to conform to AASHTO policy against suffixed routes
I-81	232.63	374.38	I-81 at Maryland border near Greencastle	I-81 at New York border near Hallstead	01956-01-011956	current	Called the American Legion Memorial Highway while in Pennsylvania^[3]
I-83	50.8	81.8	I-83 at Maryland border near Shrewsbury	I-81/US 322 in Harrisburg	01956-01-011956	current	Known as the Veterans of Foreign Wars of the United States Memorial Highway as well as the Harrisburg–York–Baltimore Expressway^[3]
I-84	54.55	87.79	I-81/I-380/US 6 in Dunmore	I-84 at New York border in Matamoras	01958-01-011958	current
I-86	6.99	11.25	I-90 in Greenfield Township I-86 at New York border in South Waverly	I-86 at New York border in North East Township I-86 at New York border in South Waverly	01999-01-011999	current	Named the Hopkins-Bowser Highway;^[3] portion of its future route maintained by New York State
I-90	46.4	74.7	I-90 at Ohio border in Springfield Township	I-90 at New York border in North East Township	01956-01-011956	current	Known as the AMVETS Memorial Highway^[3]
I-95	44.25	71.21	I-95 at Delaware border near Marcus Hook	I-95 at New Jersey border near Bristol	01956-01-011956	current	Known as the Vietnam Veterans Memorial Highway^[3]
I-99	85.780	138.050	I-70/I-76/US 220 near Bedford	US 220/PA 26 near Bellefonte	01998-01-011998	current	Known as the Appalachian Thruway; will eventually extend to the New York state line^[3]
Former

Auxiliary Interstate Highways


Number	Length (mi)^[4]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-176	11.33	18.23	I-76 in Morgantown	US 422 near Reading	01964-01-011964	current	Also called the Morgantown Expressway^[3]
I-178	—	—	—	—	—	01971-01-011971	Cancelled
I-179	—	—	—	—	01958-01-011958	01968-01-011968	Replaced by its parent route, I-79
I-180	28.85	46.43	I-99/US 15/US 220 in Williamsport	I-80/PA 147 near Milton	01984-01-011984	current
I-180	—	—	—	—	—	01964-01-011964	Now part of I-176
I-276	29.78	47.93	I-76 in King of Prussia	I-95 and I-295 in Bristol Township	01964-01-011964	current
I-280	—	—	—	—	01958-01-011958	01964-01-011964	Now part of Pennsylvania Turnpike
I-279	13.32	21.44	I-376/US 22/US 30 in Pittsburgh	I-79 in Franklin Park	01972-01-011972	current	Also known as the Parkway North, North Shore Expressway, East Street Valley Expressway and the Raymond E. Wilt Memorial Highway^[3]
I-283	2.91	4.68	I-76 near Highspire	I-83/US 322 near Harrisburg	01972-01-011972	current	The highway is entirely in Dauphin County and Lancaster County and is an eastern shore bypass of Harrisburg.^[3]
I-295	10.324	16.615	I-95/I-276 in Bristol Township	I-295 at New Jersey border near Yardley	02018-01-012018	current
I-376	84.70	136.31	I-80/PA 760 in Shenango Township	I-76/US 22 in Monroeville	01972-01-011972	current	Follows the Beaver Valley Expressway, the James E. Ross Highway, and the Penn-Lincoln Parkway ^[3]
I-378	—	—	—	—	01968-01-011968	01971-01-011971	Replaced by PA 378
I-380	28.25	45.46	I-80 in Tunkhannock Township	I-81/I-84/US 6 in Dunmore	01973-01-011973	current	Known as the Scranton-Dunmore Expressway in Scranton^[3]
I-476	132.10	212.59	I-95 in Woodlyn	I-81/US 6/US 11 in Clarks Summit	01964-01-011964	current	Longest Auxiliary Interstate in Pennsylvania and the United States.^[3]
I-479	—	—	—	—	01966-01-011966	01971-01-011971	Early number for I-579
I-480	—	—	—	—	01958-01-011958	01964-01-011964	Now part of I-476
I-495	—	—	—	—	01956-01-011956	01958-01-011958	Early number for I-476
I-579	1.57	2.53	PA 885 in Pittsburgh	I-279/US 19 Truck/PA 28 in Pittsburgh	01962-01-011962	current	Called the Crosstown Boulevard ^[3]
I-676	2.15	3.46	I-76/US 30 in Philadelphia	I-676/US 30 at New Jersey border in Philadelphia	01964-01-011964	current	Called the Vine Street Expressway ^[3]
I-695	—	—	I-95 near Philadelphia International Airport	I-95 in Philadelphia	01964-01-011964	01977-01-011977	Never built
I-876	—	—	—	—	01971-01-011971	01972-01-011972	Short lived renumbering of I-479, now I-579
I-895	—	—	I-295 in Burlington, NJ	I-95 in Bristol	01963-01-011963	01981-01-011981	Never built
Former

Business routes


Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-83 BL	6.81	10.96	I-83 in York Township	I-83/PA 181 in Manchester Township	01957-01-011957	current	Serves York, running along George Street;^[3] only Interstate business route in Pennsylvania until 2009
I-376 BL	6.26	10.07	I-376 in Findlay Township	I-376 in Moon Township	02009-01-012009	current	Runs along Airport Parkway near the Pittsburgh International Airport ^[3]

Gallery

Entering Pennsylvania on I-86 westbound in Erie County
I-95 at I-276 exit
I-90 at I-79 exit
I-81 at I-78 exit
I-99 to I-80
I-176 end at US 422
I-83 and I-283
I-476 north of US 1
I-376 in Pittsburgh
I-70 and I-76 at eastern split
I-76 approaching I-676
I-79 at I-70

References

↑ "Key Facts About Pennsylvania's Interstate Highway System" (PDF). TRIP. Archived from the original (PDF) on September 29, 2006. Retrieved June 15, 2008.
↑ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration . Retrieved July 26, 2022.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Kitsko, Jeffrey J. (2000–2008). "Interstate Highways". Pennsylvania Highways. Retrieved July 9, 2008.^{[ self-published source ]}
↑ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". Federal Highway Administration . Retrieved May 10, 2016.

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[1] "Key Facts About Pennsylvania's Interstate Highway System" (PDF). TRIP. Archived from the original (PDF) on September 29, 2006. Retrieved June 15, 2008.

[length-2] Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration . Retrieved July 26, 2022.

[notes-3] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Kitsko, Jeffrey J. (2000–2008). "Interstate Highways". Pennsylvania Highways. Retrieved July 9, 2008.^{[ self-published source ]}

[length2-4] Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". Federal Highway Administration . Retrieved May 10, 2016.

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