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

National Register listings: 18

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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Outstanding Buildings

1. *John Wilson House (1861). 19866 365th Road. Adams.
2. Josephus Poindexter House (c. 1890). 25595 Sportsman's Club Road. Adel. Eastlake.
3. Daniel Flinn House (1863). 11375 Booneville Road. Boone. Gothic Revival.
4. *Shafer Farm (c. 1905). 31353 Booneville Road. Boone. Queen Anne.
5. *John Miller House (1869). 33648 Overton Circle. Van Meter. Italianate.