The state of Pennsylvania is located in the Northeastern and Middle Atlantic regions of the United States. It borders:
- Delaware and Maryland to the south
- West Virginia to the southwest
- Ohio to the west
- New York to the north
- New Jersey to the east
- Philadelphia
- Pittsburgh
- Allentown and Erie
- Harrisburg
- Area Code 484 (Created in 1999)
- Area Code 610 (Created in 1994)
- Area Code 215 (Created in 1947)
- Area Code 267 (Created in 1997)
- Area Code 717 (Created in 1947)
- Area Code 412 (Created in 1947)
- Area Code 878 (Created in 2001)
- Area Code 724 (Created in 1998)
- Area Code 570 (Created in 1998)
- Area Code 814 (Created in 1947)
- Area Code 445 (Not Implemented)
- Area Code 835 (Not Implemented)
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA
- CENTURYTEL TEL OF ALABAMA, LLC (NORTHERN)
- CF COMMUNICATIONS, LLC DBA TELEKENEX - CA
- CORR WIRELESS COMMUNICATIONS, LLC
- GRACEBA TOTAL COMMUNICATIONS
- LEVEL 3 COMMUNICATIONS, LLC - CA
- NEW CINGULAR WIRELESS PCS, LLC
- NEW CINGULAR WIRELESS PCS, LLC - IL
- PACIFIC BELL
- QWEST CORPORATION
- ROYAL STREET COMMUNICATIONS, LLC
- SBC INTERNET SERVICES, INC.
- SPRINT SPECTRUM L.P.
- TELEPORT COMMUNICATIONS GROUP - PHOENIX
- TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO
- U.S. TELEPACIFIC CORP. - CA
- USA MOBILITY WIRELESS, INC.
- VERIZON CALIFORNIA INC.-CA (GTE)
A brief description of Pennsylvania Area Codes is given below: