List of Interstate Highways in Pennsylvania


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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]

Interstate Highways of the Pennsylvania State Route System

Interstate 83 marker

Interstate 376 marker


Interstate 83 Business marker

Interstate 376 Business marker

Route markers for Interstate 83, Interstate 376, Interstate 83 Business, and Interstate 376 Business

Map

Interstate Highways highlighted in red

System information
NotesAll routes are assigned State Route (SR X) numbers, usually corresponding to the signed numbers. Interstates are generally state-maintained.
Highway names
InterstatesInterstate X (I-X)
Business Loops:Interstate X Business (I-X Bus.)
System links

Primary Interstate Highways

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Auxiliary Interstate Highways

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  • 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

  1. ^ "Key Facts About Pennsylvania's Interstate Highway System" (PDF). TRIP. Archived from the original (PDF) on September 29, 2006. Retrieved June 15, 2008.
  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.
  3. ^ a b c d e f g h i j k l m n o p q r Kitsko, Jeffrey J. (2000–2008). "Interstate Highways". Pennsylvania Highways. Retrieved July 9, 2008.[self-published source]
  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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