1850 Counties of  Pennsylvania

    in area Courts held at Pop in 1850
Adams Co, PA southern part 360 sq miles Gettysburgh 25,981
Alleghany Co, PA south west part, water by Alleghany, Youghiogheny, Monongabia & Ohio rivers 575 sq miles Pittsburgh 138,300
Armstrong Co, PA western part, water by Alleghany river 700 sq miles Kittaning 29,560
Beaver Co, PA in western side, crossed by Ohio & Beaver rivers 600 sq miles Beaver 26,689
Bedford Co, PA on southern boundary, drained by Juniata & Potomac rivers 1,600 sq miles Bedford 23,052
Berks Co, PA in Southeastern side 1,020 sq miles Reading 77,129
Blair Co, PA central part, crossed by Frankstown branch of Juniata River 700 sq miles Hollidaysburgh 21,777
Bucks Co, PA easterly boundary, on west side of Delaware river 600 sq miles Doylestown 56,091
Butler Co, PA western part 840 sq miles Butler 30,346
Cambria Co, PA central part, drained by Connemaugh river 720 Ebensburgh 17,773
Carbon Co, PA eastern part, crossed by Lehigh river blank Mauch Chunk 15,686
Centre Co, PA central part, west branch Susquehanna river on NW 1560 Bellefonte 23,355
Chester Co, PA southeast corner, Schuylkill river on NE 729 Westchester 66,438
Clearfield Co, PA western part, crossed by west branch of Susquehanna river 1425 Clearfield 12,586
Clinton Co, PA northern part, crossed by west branch of Susquehanna river 840 Lock Haven 11,207
Columbia Co, PA central part, crossed by east branch Susquehanna river 700 Danville 17,710
Crawford Co, PA west boundary 1016 Mendville 37,849
Cumberland Co, PA southern part, Susquehanna river on northeast 544 Carlisle 34,327
Dauphin Co, PA southeast part, Susquehanna river on the west 608 Harrisburgh (also State Capital) 35,754
Delaware Co, PA southeast part, Delaware river on southeast 220 Chester 24,679