Pennsylvania has 67 counties and 21 congressional districts: 48 counties are wholly within a given congressional district; 19 counties are divided among more than one congressional district.
UNDIVIDED COUNTIES (wholly within one Congressional District)
- CD # 4: Beaver, Lawrence
- CD # 5: Cameron, Clinton, Elk, Forest, Jefferson, McKean, Potter, Tioga, Union, Venango and Warren
- CD # 6: Berks and Schuylkill
- CD # 8: Bucks
- CD # 9: Bedford, Blair, Franklin, Fulton, Huntingdon, Juniata, Mifflin and Snyder
- CD # 10: Bradford, Lackawanna, Pike, Sullivan, Susquehanna, Wayne and Wyoming
- CD # 11: Carbon, Columbia, Luzerne and Montour
- CD # 12: Cambria, Indiana and Somerset
- CD # 15: Lehigh and Northampton
- CD # 17: Dauphin and Lebanon
- CD # 19: Adams and York
- CD # 20: Greene and Washington
- CD # 21: Erie and Mercer
DIVIDED COUNTIES (split between more than one Congressional District):
- Allegheny: CDs 4, 14, 18 and 20
- Armstrong: CDs 5 and 12
- Butler: CDs 4 and 21
- Centre: CDs 5 and 9
- Chester: CDs 7 and 16
- Clarion: CDs 5 and 12
- Clearfield: CDs 5 and 9
- Crawford: CDs 5 and 21
- Cumberland: CDs 17 and 19
- Delaware: CDs 1, 2 and 7
- Fayette: CDs 12 and 20
- Lancaster: CDs 16 and 17
- Lycoming: CDs 5 and 10
- Monroe: CDs 10 and 11
- Montgomery: CDs 6, 7, 8, 13 and 15
- Northumberland: CDs 6 and 11
- Perry: CDs 9 and 17
- Philadelphia (coterminous with the City of Philadelphia): CDs 1, 2 and 3
- Westmoreland: CDs 4, 12 and 20
CD # 3 wholly within the City and County of Philadelphia
CD # 13 wholly within Montgomery County
CDs # 14 and # 18 wholly within Allegheny County
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