Warren County, Pennsylvania

Founding: 1819 (declared in 1800)
Parent counties: Allegheny and Lycoming

Namesake: Joseph Warren, Boston revolutionary leader
Seat: Warren (1819–)

Land area: 884 square miles

Population (2020): 38,587

Population (historic): 1,976 (1820); 13,671 (1850); 23,897 (1870); 38,946 (1900); 41,453 (1930)

Periods of population growth: 1800–1940; 1950–1970

Subdivisions: One city; five boroughs; five CDPs; 21 townships

National Register listings: 12

Pre-1940 residences (estimated): 7,120 (30.2%)
Pre-1940 housing survival rate: 68.9%
Pre-1860 housing survival rate (1940): 18.7%

Farm housing in disrepair (1950): 16.8%

Nonfarm housing in disrepair (1950): 7%
Average farmhouse value (1930): $1,380
Average outbuilding value (1930): $1,149
Average farmhouse size (1940): 7.1 rooms
Number of farms (1920): 2,353
Average farm size (1920): 43.6 acres
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Warren

Namesake: Joseph Warren, Boston physician

Founding: 1795 (platting); 1819 (post office); 1832 (incorporation)

Population (2020): 9,404

Population (historic): 737 (1840); 1,738 (1860); 2,810 (1880); 8,043 (1900); 14,863 (1930)

Periods of population growth: pre-1840–1940
Pre-1940 residences (estimated): 2,991 (61%)
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Outstanding Buildings

1. *Guy Irvine House (1831–1835). 5605 Market Street. Pine Grove. Greek Revival/Federal.