Marion County, Iowa

Founding: 1845
Parent county: Unorganized territory

Namesake: Francis Marion, Continental Army officer
Seat: Knoxville (1845–)

Land area: 555 square miles

Population (2020): 33,414

Population (historic): 5,482 (1850); 24,436 (1870); 23,058 (1890); 22,995 (1910); 25,727 (1930)

Periods of population growth: pre-1850–1880; 1890s; 1910–1940; 1960–2020

Subdivisions: Nine cities; 12 townships

National Register listings: 28

Pre-1940 residences (estimated): 3,249 (22.9%)
Pre-1940 housing survival rate: 47.4%
Pre-1860 housing survival rate (1940): 2.9%

Farm housing in disrepair (1950): 5.2%

Nonfarm housing in disrepair (1950): 4.5%

Average farmhouse value (1930): $1,757
Average outbuilding value (1930): $1,581
Average farmhouse size (1940): 6.2 rooms
Number of farms (1920): 2,402
Average farm size (1920): 114.7 acres
Sources of settlement: Ohio, Holland, Pennsylvania, Indiana, Illinois, and Virginia
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Knoxville

Namesake: Henry Knox, U.S. army officer

Founding: 1845 (platting); 1846 (post office); 1855 (incorporation)

Population (2020): 7,595

Population (historic): 1,124 (1860); 2,577 (1880); 3,131 (1900); 4,697 (1930)

Periods of population growth: 1845–1860; 1870–1960; 1970–1990; 2010s
Pre-1940 residences (estimated): 889 (24.8%)
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Outstanding Buildings

1. *Jackson Ramey Farm (c. 1875). 1834 Road T15. Knoxville. Italianate.
2. *Abram Dykstra House (c. 1900). 211 Main Street. Summit. Queen Anne/Classical Revival.