Mercer County, Pennsylvania
Founding: 1803 (declared in 1800) Parent county: Allegheny Namesake: Hugh Mercer, Continental Army general Seat: Mercer (1804–) Land area: 673 square miles Population (2020): 110,652 Population (historic): 3,228 (1800); 32,873 (1840); 49,977 (1870); 57,387 (1900); 99,246 (1930) Periods of population growth: pre-1800–1880; 1890–1960 Subdivisions: Three cities; 14 boroughs; two CDPs; 31 townships Pre-1940 residences (estimated): 13,885 (26.6%) Pre-1940 housing survival rate: 60.2% Pre-1860 housing survival rate (1940): 17.7% Farm housing in disrepair (1950): 11.6% Nonfarm housing in disrepair (1950): 6.2% Average farmhouse value (1930): $1,847 Average outbuilding value (1930): $1,470 Average farmhouse size (1940): 6.8 rooms Number of farms (1920): 4,499 Average farm size (1920): 54.6 acres _______________________________________________________________...