Butler County, Ohio

Founding: 1803
Parent county: Hamilton

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

Land area: 467 square miles

Population (2020): 390,357

Population (historic): 11,150 (1810); 30,789 (1850); 42,579 (1880); 56,870 (1900); 114,084 (1930)

Periods of population growth:  pre-1810–2020

Subdivisions: Seven cities; five villages; eight CDPs; 13 townships

Pre-1940 residences (estimated): 19,566 (13.2%)
Pre-1940 housing survival rate: 51.4%
Pre-1860 housing survival rate (1940): 29.1%

Farm housing in disrepair (1950): 4.9%

Nonfarm housing in disrepair (1950): 5.3%
Average farmhouse value (1930): $2,790
Average outbuilding value (1930): $2,131

Average farmhouse size (1940): 6.2 rooms
Number of farms (1920): 2,534
Average farm size (1920): 85.5 acres
Sources of settlement: Germany, Ireland, Pennsylvania, Kentucky, Virginia, New York, and New Jersey
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Hamilton

Namesake: Fort Hamilton, which once occupied the city's site

Founding: 1803 (platting); 1804 (post office); 1810 (incorporation)

Population (2020): 63,399

Population (historic): 660 (1820); 3,210 (1850); 12,122 (1880); 23,914 (1900); 52,176 (1930)

Periods of population growth: pre-1820–1930; 1940–1960; 2000–2020
Pre-1940 residences (estimated): 9,139 (32.2%)
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