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