List of Interstate Highways in Pennsylvania

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Interstate Highways of the Pennsylvania State Route System
Interstate 76 markerInterstate 476 marker
Interstate 83 Business markerInterstate 376 Business marker
Route markers for Interstate 76, Interstate 476, Interstate 83 Business, and Interstate 376 Business
Map of Interstate Highways in Pennsylvania
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


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, Interstate highways are maintained by the Pennsylvania Department of Transportation (PennDOT). 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[edit]

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 near West Alexander I-70/US 522 at Maryland border near Warfordsburg 1956 current Interstate 70 enters Pennsylvania at the West Virginia state line one mile (1.6 km) west of West Alexander in Washington County. The highway multiplexes with I-76 from Exit 75 to Exit 161 as the Pennsylvania Turnpike. In Breezewood, I-70 leaves I-76 and the Pennsylvania turnpike veering south toward the Maryland border. It exits the state two miles (3 km) east of Warfordsburg in Fulton County.[3][4]
I-76 349.67 562.74 I-76 at Ohio border near Enon Valley I-76 at New Jersey border in Philadelphia 1964 current Interstate 76 enters Pennsylvania at the Ohio border northwest of Enon Valley in Lawrence County as the Pennsylvania Turnpike. The highway initially heads southeast through Pittsburgh to Somerset before turning east. At Exit 326, the highway becomes the Schuylkill Expressway. I-76 leaves the state at the New Jersey state line in Philadelphia via the Walt Whitman Bridge.[3][4]
I-78 75.23 121.07 I-81 in Union Township I-78 at New Jersey border in Williams Township 1956 current Interstate 78 begins at I-81 five miles (8 km) west of Fredericksburg in Lebanon County. It is multiplexed with U.S. Route 22 as the William Penn Highway from Exit 8 in Fredericksburg to Exit 51 in Allentown. The highway was briefly designated as I-80N from 1957 to 1958. I-78 exits Pennsylvania and enters New Jersey via the Interstate 78 Toll Bridge in Easton.[3][4]
I-79 182.72 294.06 I-79 at West Virginia border near Mount Morris Bayfront Parkway in Erie 1956 current Interstate 79 enters Pennsylvania at the West Virginia state line one mile (1.6 km) south of Mount Morris in Greene County. The highway travels north to Erie, bypassing Pittsburgh. I-79 is named to Raymond P. Shafer Highway for its entire length. Between Exits 65 and 68, I-79 is part of the Yellow Belt of the Pittsburgh Belt System. The only multiplex on the route is with I-70 in Washington from Exit 34 to Exit 38. The interstate ends at PA 5/PA 290 and the Bayfront Parkway at Exit 183 in Erie.[3][4]
I-80 311.07 500.62 I-80 at Ohio border in Shenango Township I-80 at New Jersey border in Delaware Water Gap 1956 current Interstate 80 enters Pennsylvania at the Ohio state line three miles (5 km) west of West Middlesex in Mercer County. The route is known as the Z.H. Confair Memorial Highway and the Keystone Shortway. I-80 passes through no major cities while in Pennsylvania. It leaves the state and enters New Jersey via the Delaware Water Gap Toll Bridge in Stroudsburg, Monroe County.[3][4]
I-81 232.63 374.38 I-81 at Maryland border near Greencastle I-81 at New York border near Hallstead 1956 current Interstate 81 is the longest north-south interstate in Pennsylvania. It enters the state at the Maryland state line in Franklin County and heads northeast to Scranton, bypassing Harrisburg, before turning north for New York. It is known as the American Legion Memorial Highway while in Pennsylvania. In the Harrisburg area, I-81 is also part of the Capital Beltway. The interstate leaves Pennsylvania at the New York border two miles (3 km) north of Great Bend in Susquehanna County.[3][4]
I-83 50.8 81.8 I-83 at Maryland border near Shrewsbury I-81/US 322 in Harrisburg 1956 current Interstate 83 enters Pennsylvania at the Maryland border four miles (6 km) south of Shrewsbury in York County and heads north for York and Harrisburg. The road is known as the Veterans of Foreign Wars of the United States Memorial Highway as well as the Harrisburg-York-Baltimore Expressway. While in Harrisburg it is also known as the Capital Beltway. I-83 ends at I-81 at Exit 70 in Harrisburg.[3][4]
I-84 54.55 87.79 I-81/I-380/US 6 in Dunmore I-84 at New York border in Matamoras 1958 current Interstate 84 begins at I-81 at Exit 187 in Scranton and heads east to the New York state line over the Delaware River in Matamoras. Originally, plans were made to build the interstate to cross extreme northern Pennsylvania, but the mountains proved to be too big of a challenge. Scranton is the only major city on the route.[3][4]
I-86 6.99 11.25 I-90 near Erie I-86 at New York border near North East 1999 current Only seven miles of Interstate 86 is in Pennsylvania. It runs from I-90 at Exit 37 in Erie east to the New York state line south of North East. The interstate is named the Hopkins-Bowser Highway.[3][4]
I-90 46.4 74.7 I-90 at Ohio border near West Springfield I-90 at New York border near North East 1956 current Interstate 90, known as the AMVETS Memorial Highway, enters Pennsylvania from Ohio three miles (5 km) west of Springfield and exits at the New York border two miles (3 km) east of North East. The highway crosses Erie County along the lake, bypassing the city of Erie.[3][4]
I-95 51.08 82.21 I-95 at Delaware border near Marcus Hook I-95 at New Jersey border near Yardley 1956 current Interstate 95 enters Pennsylvania from Delaware at Marcus Hook in Delaware County. I-95, known as the Vietnam Veterans Memorial Highway, passes through Delaware, Philadelphia, and Bucks counties along the Delaware River before leaving the state and entering New Jersey via the Scudder Falls Bridge in Yardley. A construction project will eventually see I-95 being rerouted onto the Pennsylvania Turnpike and will enter New Jersey, via the Delaware River Turnpike Connector Bridge.[3][4]
I-99 85.780 138.050 I-70/I-76/US 220 near Bedford I-80/US 220 near Bellefonte 1998 current Interstate 99 is an incomplete highway in central Pennsylvania. It is known as the Appalachian Thruway and is located entirely within the state. It begins at Business US 220 in Bedford, Bedford County. It continues north through Altoona and State College before ending at a non-freeway interchange with I-80 near Bellefonte. The entirety of the current route is multiplexed with US 220. It will eventually extend southward to the Maryland border along the current alignment of US 220, and northward along US 220 to Williamsport, and along US 15 from there to the New York border to Interstate 86 in Painted Post, New York.[3][4]

Auxiliary Interstate Highways[edit]

Number Length (mi)[5] 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 1964 current Interstate 176, also called the Morgantown Expressway, connects Reading to the turnpike in Morgantown. It begins at I-76 at Exit 298 in and ends in Reading at US 422.[3][4]
I-180 28.85 46.43 US 15/US 220 in Williamsport I-80/PA 147 near Milton 1984 current Interstate 180 is a 29-mile (47 km) road that connects Williamsport, Lycoming County, to I-80 at Exit 212B near Milton in Northumberland County. The route begins at US 15/US 220 at Exit 29.[3][4]
I-276 32.65 52.55 I-76 in King of Prussia I-95 at New Jersey border near Bristol 1964 current Interstate 276 begins at Exit 326 in King of Prussia, Montgomery County, and ends in Bristol crossing into New Jersey via the Delaware River Turnpike Bridge. I-276 is notable for ending at the middle of the bridge on the PA/NJ State Line, but will be truncated to I-95/future I-295 interchange with the Pennsylvania Turnpike.[3][4]
I-279 13.32 21.44 I-376/US 22/US 30 in Pittsburgh I-79 in Franklin Park 1972 current Interstate 279, also known as the Parkway North, begins at I-376 at the Fort Pitt Bridge in Pittsburgh. It travels 13 miles (21 km) north through downtown Pittsburgh before joining I-79 at Exit 72 in Franklin Park. Other names for the road are the North Shore Expressway, East Street Valley Expressway and the Raymond E. Wilt Memorial Highway.[3][4]
I-283 2.91 4.68 I-76 near Highspire I-83/US 322 near Harrisburg 1972 current Interstate 283 begins at I-76 Exit 247 in Highspire and ends at I-83 Exit 46A in Paxtang. The highway is entirely in Dauphin County and is an eastern shore bypass of Harrisburg.[3][4]
I-295 I-95/I-276 in Bristol Township I-295 at New Jersey border near Yardley proposed Interstate 295 will begin at the I-95/I-276/PA Turnpike interchange (currently under construction) and will utilize the existing I-95 right-of-way between the interchange and the Scudder Falls Bridge to New Jersey.[3][4]
I-376 84.70 136.31 I-80/PA 760 near Hermitage I-76/US 22 in Monroeville 1972 current Interstate 376 begins at I-80 near Sharon and follows the Beaver Valley Expressway and the James E. Ross Highway south to Pittsburgh International Airport. From there, the route continues east along the Penn-Lincoln Parkway to I-76 exit 57 in Monroeville. It is concurrent with U.S. Route 22 (the William Penn Highway) east of PA 60 and with US 30 (the Lincoln Highway) from PA 60 to Wilkinsburg.[3][4]
I-380 28.25 45.46 I-80 in Tunkhannock Township I-81/I-84/US 6 in Dunmore 1973 current Interstate 380, known as the Scranton-Dunmore Expressway in Scranton, begins at I-80 at Exit 293 in Crescent Lake, Monroe County. It ends at I-81 at Exit 187 in Scranton. The Interstate gives Scranton direct access to the Pocono Mountains.[3][4]
I-476 132.10 212.59 I-95 in Woodlyn I-81/US 6/US 11 in Clarks Summit 1964 current Interstate 476, the Blue Route, begins at I-95 Exit 7 in Chester in Delaware County. At Exit 20, the highway becomes the PA Turnpike Northeast Extension. The highway travels north around Philadelphia and through Montgomery, Bucks, Lehigh, Carbon and Luzerne counties. It passes Allentown before it ends in Clarks Summit near Scranton at I-81/US 6/US 11. It is the longest Auxiliary Interstate in Pennsylvania and the United States.[3][4]
I-576 I-376 in Findlay Township PA 43 in Pittsburgh proposed Interstate 576 will begin at the Pittsburgh International Airport and will travel in an east-west direction along the Southern Beltway route in Pittsburgh, terminating at the Mon-Fayette Expressway (Pennsylvania Route 43). Route is currently designated as Pennsylvania Route 576, but will most likely be upgraded to Interstate Highway status after the Southern Beltway is completed.[3][4]
I-579 1.57 2.53 PA 885 in Pittsburgh I-279/US 19 Truck/PA 28 in Pittsburgh 1962 current The Crosstown Boulevard is a short Interstate in Pittsburgh. It connects the Boulevard of the Allies (PA 885) to I-279 at exit 8A.[3][4]
I-676 2.15 3.46 I-76/US 30 in Philadelphia I-676/US 30 at New Jersey border in Philadelphia 1964 current The Vine Street Expressway takes traffic out of Philadelphia into New Jersey via the Benjamin Franklin Bridge. The route begins at Exit 344 of I-76.[3][4]
  •       Future

Business routes[edit]

Number Length (mi)[4] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I‑83 Bus. 6.81 10.96 I-83 in York Township I-83/PA 181 in Manchester Township 1957 current Interstate 83 Business passes through the city of York, running along George Street.[3][4]
I‑376 Bus. 6.26 10.07 I-376 in Findlay Township I-376 in Moon Township 2009 current Interstate 376 Business runs along Airport Parkway near the Pittsburgh International Airport.[3][4]

See also[edit]

References[edit]