List of Interstate Highways in Pennsylvania

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

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]