Dallas County, Iowa

Founding: 1847 (declared in 1846)
Parent county: Unorganized territory

Namesake: George Dallas, Pennsylvania politician
Seat: Adel (1847–)

Land area: 588 square miles

Population (2020): 99,678

Population (historic): 854 (1850); 12,019 (1870); 20,479 (1890); 23,628 (1910); 25,493 (1930)

Periods of population growth: pre-1850–1930; 1950–2020

Subdivisions: 14 cities; 16 townships

Pre-1940 residences (estimated): 3,736 (10.3%)
Pre-1940 housing survival rate: 58.7%
Pre-1860 housing survival rate (1940): 6.1%

Farm housing in disrepair (1950): 3.2%

Nonfarm housing in disrepair (1950): 4.6%

Average farmhouse value (1930): $2,186
Average outbuilding value (1930): $2,336
Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 2,320
Average farm size (1920): 129.7 acres
Sources of settlement: Iowa, Indiana, Ohio, Illinois, Pennsylvania, and New York
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Adel

Namesake: Unknown

Founding: 1847 (platting as Penoach); 1847 (post office); 1877 (incorporation)

Population (2020): 6,153

Population (historic): 466 (1860); 989 (1880); 1,213 (1900); 1,669 (1930)

Periods of population growth: 1847–2020
Pre-1940 residences (estimated): 402 (21.8%)
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