Miami County, Ohio

Founding: 1807
Parent county: Montgomery

Namesake: The Miami River
Seat: Troy (1807–)

Land area: 407 square miles

Population (2020): 108,774

Population (historic): 3,941 (1810); 19,688 (1840); 32,740 (1870); 43,105 (1900); 51,301 (1930)

Periods of population growth: pre-1810–2020

Subdivisions: Three cities; nine villages; 12 townships

Pre-1940 residences (estimated): 10,594 (23.9%)
Pre-1940 housing survival rate: 72%
Pre-1860 housing survival rate (1940): 21.4%

Farm housing in disrepair (1950): 4.2%

Nonfarm housing in disrepair (1950): 5.4%
Average farmhouse value (1930): $1,855
Average outbuilding value (1930): $1,829

Number of farms (1920): 3,260
Average farm size (1920): 66.9 acres
Sources of settlement: Pennsylvania, Virginia, Maryland, Germany, and New Jersey
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Troy

Namesake: The legendary Anatolian city of Troy

Founding: 1807 (platting); 1813 (incorporation)

Population (2020): 26,305

Population (historic): 179 (1810); 1,956 (1850); 3,803 (1880); 5,881 (1900); 8,675 (1930)

Periods of population growth: 1807–2020
Pre-1940 residences (estimated): 2,055 (17.9%)
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