Genealogy at the State Library of Pennsylvania

Serving Philadelphia, Bucks, Chester, Delaware and Montgormery counties. The collection also includes the archives of the American Catholic Historical Society.

Serving Berks, Carbon, Lehigh, Northampton and Schuylkill counties.

Serving Bedford, Blair, Cambria, Centre, Clinton, Fulton, Huntingdon and Somerset counties.

Serving Erie, Cameron, Clarion, Clearfield, Crawford, Elk, Forest, Jefferson, McKean, Mercer, Potter, Venango and Warren counties. Diocesan archives do not contain baptismal, marriage or death records. Researchers are requested to contact their ancestor's parish directly.

Serving Armstrong, Fayette, Indiana, and Westmoreland counties.

Serving Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata, Lancaster, Lebanon, Mifflin, Montour, Northumberland, Perry, Snyder, Union and York counties.

Serving Allegheny, Beaver, Butler, Greene, Lawrence and Washington counties. The Diocese of Pittsburgh Archives and Records Center website offers genealogical tips for researching Catholic ancestors including the rules for access to sacramental records and a map of Pittsburgh-area parishes.

Serving Tioga, Bradford, Susquehanna, Wayne, Lycoming, Sullivan, Wyoming, Lackawanna, Pike, Luzerne and Monroe counties.