Butler County, Pennsylvania

Founding: 1803 (declared in 1800)
Parent county: Allegheny

Namesake: Richard Butler, Continental Army officer
Seat: Butler (1803–)

Land area: 789 square miles

Population (2020): 193,763

Population (historic): 3,916 (1800); 22,378 (1840); 36,510 (1870); 56,962 (1900); 80,480 (1930)

Periods of population growth: pre-1800–2020

Subdivisions: One city; 23 boroughs; nine CDPs; 33 townships

Pre-1940 residences (estimated): 12,484 (15.3%)
Pre-1940 housing survival rate: 59.4%
Pre-1860 housing survival rate (1940): 16.8%

Farm housing in disrepair (1950): 14.6%

Nonfarm housing in disrepair (1950): 7.7%
Average farmhouse value (1930): $1,815
Average outbuilding value (1930): $1,494
Average farmhouse size (1940): 5.9 rooms
Number of farms (1920): 5,274
Average farm size (1920): 56 acres
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Butler

Namesake: Richard Butler, Continental Army officer

Founding: 1803 (platting); 1805 (post office); 1816 (incorporation)

Population (2020): 13,502

Population (historic): 225 (1820); 1,148 (1850); 1,935 (1870); 10,853 (1900); 23,568 (1930)

Periods of population growth: pre-1820–1920; 1930s
Pre-1940 residences (estimated): 3,527 (51.4%)
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