- Library Company of Philadelphia
- Research specialists in American culture and history from the 17th to the 19th centuries.
- National Association of Counties: Philadelphia County, PA
- Offers contact information for the county elected officials. Includes also demographic and census data.
- National Register of Historical Places: Philadelphia County, Pennsylvania
- Gives a list of the historical properties in the county. Information includes data about the architectural style, signifacance, function, and builder.
- Philadelphia County Genealogy Trails
- Provides genealogy and history information including vital records, immigration, biographies, newspapers and surname list.
- Philadelphia County Genealogy: USGenWeb
- Offers genealogy research records for this county that includes local history, ethnic resources, directories and databases, family websites and obituary index.
- Philadelphia County Pennsylvania Genealogy
- Offers genealogy research for the county and the cities of Middle City East, Middle City West, Overbrook Hills, Philadelphia, Summerdale, William Penn Annex East, and William Penn Annex West.
- Rosenbach Museum and Library
- Filled with rare books in the hopes of aspiring curiosity and interest in learning.
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