- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
Philadelphia is a town in Jefferson County, New York, United States. The population was 1,947 at the 2010 census.
The Town of Philadelphia contains a village called Philadelphia. Both town and village are in the northeast part of Jefferson County, northeast of Watertown.
- Outstanding guide to Philadelphia family history and genealogy resources (FamilySearch Research Wiki). Birth, marriage, and death records, town histories, cemeteries, churches, newspapers, libraries, and genealogical societies.