Marion County, Iowa


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.
WWW co.marion.ia.us

Geography

According to the U.S. Census Bureau, the county has a total area of, of which is land and is water.

Major highways

Adjacent counties

Demographics

2020 census

As of the 2020 census, the county had a population of 33,414 and a population density of. The median age was 41.1 years; 23.3% of residents were under age 18 and 19.6% were 65 years of age or older. For every 100 females there were 98.8 males, and for every 100 females age 18 and over there were 97.2 males.
The racial makeup of the county was 93.2% White, 0.9% Black or African American, 0.2% American Indian and Alaska Native, 1.2% Asian, 0.1% Native Hawaiian and Pacific Islander, 0.6% from some other race, and 3.8% from two or more races. Hispanic or Latino residents of any race comprised 2.1% of the population.
53.0% of residents lived in urban areas, while 47.0% lived in rural areas.
There were 13,145 households in the county, of which 29.4% had children under the age of 18 living in them. Of all households, 55.6% were married-couple households, 17.0% were households with a male householder and no spouse or partner present, and 21.8% were households with a female householder and no spouse or partner present. About 27.7% of all households were made up of individuals and 12.7% had someone living alone who was 65 years of age or older.
The 2020 census counted 14,073 housing units, of which 13,145 were occupied, leaving 6.6% vacant; 74.6% of occupied housing units were owner-occupied and 25.4% were renter-occupied, with a homeowner vacancy rate of 1.4% and a rental vacancy rate of 5.4%.

2010 census

The 2010 census recorded a population of 33,309 in the county, with a population density of. There were 13,914 housing units, of which 12,723 were occupied.

2000 census

As of the census of 2000, there were 32,052 people, 12,017 households, and 8,532 families residing in the county. The population density was. There were 12,755 housing units at an average density of. The racial makeup of the county was 97.46% White, 0.42% Black or African American, 0.19% Native American, 1.03% Asian, 0.04% Pacific Islander, 0.22% from other races, and 0.64% from two or more races. 0.80% of the population were Hispanic or Latino of any race.
There were 12,017 households, out of which 33.00% had children under the age of 18 living with them, 61.20% were married couples living together, 6.90% had a female householder with no husband present, and 29.00% were non-families. 25.60% of all households were made up of individuals, and 11.90% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.02.
In the county, the population was spread out, with 25.30% under the age of 18, 10.20% from 18 to 24, 26.50% from 25 to 44, 22.10% from 45 to 64, and 15.90% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 98.60 males. For every 100 females age 18 and over, there were 95.80 males.
The median income for a household in the county was $42,401, and the median income for a family was $50,052. Males had a median income of $36,460 versus $25,573 for females. The per capita income for the county was $18,717. About 5.20% of families and 7.60% of the population were below the poverty line, including 8.70% of those under age 18 and 10.80% of those age 65 or over.

Communities

Cities

Unincorporated communities

Townships

Population ranking

The population ranking of the following table is based on the 2020 census of Marion County.
† county seat
RankCity/town/etc.Municipal typePopulation
1PellaCity10,464
2† 'KnoxvilleCity7,595
3PleasantvilleCity1,676
4Melcher-DallasCity1,195
5BusseyCity387
6HarveyCity236
7HamiltonCity119
8SwanCity76
9Marysville'City44