Philadelphia County, Pennsylvania

Founding: 1682
Parent county: Unorganized territory
Namesake: The city of Philadelphia
Seat: Philadelphia (1682–)
Land area: 134 square miles
Population (2020): 1,603,797
Population (historic): 54,391 (1790); 258,037 (1840); 674,022 (1870); 1,293,697 (1900); 1,950,961 (1930)
Periods of population growth: pre-1790–1920; 1940s
Pre-1940 residences (estimated): 285,003 (41.2%)
Pre-1940 housing survival rate: 51.8%
Pre-1860 housing survival rate (1940): 16.9%

Housing in disrepair (1950): 4.2%
Average farmhouse value (1930): $3,504
Average outbuilding value (1930): $19,666

Number of farms (1920): 423
Average farm size (1920): 33.5 acres
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Philadelphia

 
Namesake: A Greek neologism meaning "brotherly love"
Founding: 1682 (platting); 1701 (incorporation); 1775 (post office)
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