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Marion County, Iowa facts for kids

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Marion County
Marion County Courthouse in Knoxville
Map of Iowa highlighting Marion County
Location within the U.S. state of Iowa
Map of the United States highlighting Iowa
Iowa's location within the U.S.
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Country  United States
State  Iowa
Founded 1845
Named for Francis Marion
Seat Knoxville
Largest city Pella
Area
 • Total 571 sq mi (1,480 km2)
 • Land 555 sq mi (1,440 km2)
 • Water 16 sq mi (40 km2)  2.8%
Population
 (2020)
 • Total 33,414
 • Density 58.52/sq mi (22.594/km2)
Time zone UTC−6 (Central)
 • Summer (DST) UTC−5 (CDT)
Congressional district 2nd

Marion County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 33,414. The county seat is Knoxville. It is named for Francis Marion, a brigadier general from South Carolina in the American Revolutionary War.

Geography

According to the U.S. Census Bureau, the county has a total area of 571 square miles (1,480 km2), of which 555 square miles (1,440 km2) is land and 16 square miles (41 km2) (2.8%) is water.

Major highways

  • Iowa 5.svg Iowa Highway 5
  • Iowa 14.svg Iowa Highway 14
  • Iowa 92.svg Iowa Highway 92
  • Iowa 163.svg Iowa Highway 163
  • Iowa 316.svg Iowa Highway 316

Adjacent counties

Demographics

Historical population
Census Pop.
1850 5,482
1860 16,813 206.7%
1870 24,436 45.3%
1880 25,111 2.8%
1890 23,058 −8.2%
1900 24,159 4.8%
1910 22,995 −4.8%
1920 24,957 8.5%
1930 25,727 3.1%
1940 27,019 5.0%
1950 25,930 −4.0%
1960 25,886 −0.2%
1970 26,352 1.8%
1980 29,669 12.6%
1990 30,001 1.1%
2000 32,052 6.8%
2010 33,309 3.9%
2020 33,414 0.3%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2018
MarionCountyIowaPop2020
Population of Marion County from US census data

2020 census

The 2020 census recorded a population of 33,414 in the county, with a population density of 58.4743/sq mi (22.5771/km2). 96.24% of the population reported being of one race. 91.15% were non-Hispanic White, 0.87% were Black, 2.09% were Hispanic, 0.21% were Native American, 1.20% were Asian, 0.06% were Native Hawaiian or Pacific Islander and 4.41% were some other race or more than one race. There were 14,073 housing units, of which 13,145 were occupied.

2010 census

The 2010 census recorded a population of 33,309 in the county, with a population density of 60.1018/sq mi (23.2054/km2). There were 13,914 housing units, of which 12,723 were occupied.

Communities

Cities

Unincorporated communities

Population ranking

The population ranking of the following table is based on the 2010 census of Marion County.

county seat

Rank City/Town/etc. Municipal type Population (2010 Census)
1 Pella City 10,352
2 Knoxville City 7,313
3 Pleasantville City 1,694
4 Melcher-Dallas City 1,288
5 Bussey City 422
6 Harvey City 235
7 Hamilton City 130
8 Swan City 72
9 Marysville City 66

Gallery

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