Montgomery County, Ohio

Founding: 1803
Parent county: Hamilton

Namesake: Richard Montgomery, Continental Army general
Seat: Dayton (1803–)

Land area: 462 square miles

Population (2020): 537,309

Population (historic): 7,722 (1810); 31,938 (1840); 64,006 (1870); 130,146 (1900); 273,481 (1930)

Periods of population growth: pre-1810–1970

Subdivisions: 17 cities; five villages; one CDP; nine townships

Pre-1940 residences (estimated): 41,989 (16.5%)
Pre-1940 housing survival rate: 48.3%
Pre-1860 housing survival rate (1940): 26.2%

Farm housing in disrepair (1950): 3.4%

Nonfarm housing in disrepair (1950): 5.1%
Average farmhouse value (1930): $2,480
Average outbuilding value (1930): $1,784

Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 4,460
Average farm size (1920): 49.6 acres
Sources of settlement: Pennsylvania, Maryland, Germany, Virginia, and New Jersey
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Dayton

Namesake: Jonathan Dayton, New Jersey politician

Founding: 1796 (platting); 1803 (post office); 1805 (incorporation)

Population (2020): 137,644

Population (historic): 383 (1810); 6,067 (1840); 30,473 (1870); 85,333 (1900); 200,982 (1930)

Periods of population growth: pre-1810–1960
Pre-1940 residences (estimated): 29,264 (39.2%)
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