Iowa County, Iowa

Iowa County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 16,662, and was estimated to be 16,504 in 2025. The county seat is Marengo and the largest city is Williamsburg. Iowa County is one of seven counties in the United States to share the same name as the state in which they are located. The other six counties are Arkansas County, Hawaii County, Idaho County, New York County, Oklahoma County, and Utah County.

History Iowa County was formed on February 17, 1843. It was named for the Iowa River, which flows through the county. The first courthouse was a log cabin built in 1847. It was rented by the county until 1850 when a second courthouse was completed. In 1861 construction of a third courthouse was begun. The current courthouse was built in 1892 after the county had outgrown the previous one.

Iowa County is home to the Amana Colonies, a group of settlements of German Pietists comprising seven villages. Calling themselves the Ebenezer Society or the Community of True Inspiration (German: die Gemeinde der wahren Inspiration), they first settled in New York state near Buffalo in what is now West Seneca. However, in order to live out their beliefs in more isolated surroundings they moved west, to Iowa County in 1855, living a communal life until the mid-1930s. Today, Amana is a major tourist attraction known mainly for its restaurants and craft shops, and the colonies as a whole have been listed as a National Historic Landmark since 1965.

Geography According to the United States Census Bureau, the county has a total area of , of which is land and (0.18%) is water. It is the 26th largest county in Iowa by total area. The county is intersected by the Iowa River and the north fork of the English River.

Major highways Interstate 80 U.S. Highway 6 U.S. Highway 151 Iowa Highway 21 Iowa Highway 149 Iowa Highway 220 Iowa Highway 212

Adjacent counties Benton County (north) Linn County (northeast) Johnson County (east) Washington County (southeast) Keokuk County (south) Poweshiek County (west) Tama County (northwest)

Demographics

As of the second quarter of 2025, the median home value in Iowa County was $213,544.

As of the 2024 American Community Survey, there are 6,909 estimated households in Iowa County with an average of 2.34 persons per household. The county has a median household income of $71,223. Approximately 8.9% of the county's population lives at or below the poverty line. Iowa County has an estimated 65.3% employment rate, with 24.8% of the population holding a bachelor's degree or higher and 95.5% holding a high school diploma. There were 7,369 housing units at an average density of .

The top five reported languages (people were allowed to report up to two languages, thus the figures will generally add to more than 100%) were English (97.3%), Spanish (1.4%), Indo-European (0.7%), Asian and Pacific Islander (0.5%), and Other (0.1%).

The median age in the county was 42.4 years.

+Iowa County, Iowa – racial and ethnic composition Race / ethnicity (NH = non-Hispanic) Pop. 1980 Pop. 1990 Pop. 2000 Pop. 2010 White alone (NH) 15,305(99.20%) 14,539(99.38%) 15,390(98.21%) 15,818(96.72%) 15,394(92.39%) Black or African American alone (NH) 4(0.03%) 7(0.05%) 25(0.16%) 53(0.32%) 111(0.67%) Native American or Alaska Native alone (NH) 7(0.05%) 10(0.07%) 10(0.06%) 14(0.09%) 29(0.17%) Asian alone (NH) 38(0.25%) 34(0.23%) 47(0.30%) 54(0.33%) 84(0.50%) Pacific Islander alone (NH) — — 3(0.02%) 2(0.01%) 1(0.01%) Other race alone (NH) 33(0.21%) 1(0.01%) 4(0.03%) 9(0.06%) 57(0.34%) Mixed race or multiracial (NH) — — 40(0.26%) 98(0.60%) 491(2.95%) Hispanic or Latino (any race) 42(0.27%) 39(0.27%) 152(0.97%) 307(1.88%) 495(2.97%) Total 15,429(100.00%) 14,630(100.00%) 15,671(100.00%) 16,355(100.00%) 16,662(100.00%)

2020 census

As of the 2020 census, there were 16,662 people, 6,811 households, and 4,509 families residing in the county. The population density was . There were 7,341 housing units at an average density of . The racial makeup of the county was 93.45% White, 0.67% African American, 0.21% Native American, 0.56% Asian, 0.01% Pacific Islander, 1.34% from some other races and 3.76% from two or more races. Hispanic or Latino people of any race were 2.97% of the population.

And 96.24% of residents reported being of one race. The median age was 42.6 years; 23.4% of residents were under the age of 18 and 19.8% 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 95.9 males age 18 and over.

<0.1% of residents lived in urban areas, while 100.0% lived in rural areas.

There were 6,811 households in the county, of which 28.9% had children under the age of 18 living in them. Of all households, 55.3% were married-couple households, 16.9% were households with a male householder and no spouse or partner present, and 21.6% were households with a female householder and no spouse or partner present. About 28.7% of all households were made up of individuals and 13.7% had someone living alone who was 65 years of age or older.

There were 7,341 housing units, of which 6,811 were occupied; 7.2% were vacant. Among occupied housing units, 79.1% were owner-occupied and 20.9% were renter-occupied. The homeowner vacancy rate was 1.5% and the rental vacancy rate was 8.6%.

2010 census As of the 2010 census, there were 16,355 people, 6,677 households, and _ families residing in the county. The population density was . There were 7,258 housing units at an average density of . The racial makeup of the county was 97.84% White, 0.35% African American, 0.17% Native American, 0.34% Asian, 0.01% Pacific Islander, 0.54% from some other races and 0.75% from two or more races. Hispanic or Latino people of any race were 1.88% of the population.

2000 census As of the 2000 census, there were 15,671 people, 6,163 households, and 4,301 families residing in the county. The population density was . There were 6,545 housing units at an average density of . The racial makeup of the county was 98.70% White, 0.17% African American, 0.06% Native American, 0.30% Asian, 0.03% Pacific Islander, 0.36% from some other races and 0.38% from two or more races. Hispanic or Latino people of any race were 0.97% of the population.

There were 6,163 households, out of which 32.80% had children under the age of 18 living with them, 60.10% were married couples living together, 6.60% had a female householder with no husband present, and 30.20% were non-families. 25.90% of all households were made up of individuals, and 12.50% 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 3.03. In the county the population was spread out, with 26.40% under the age of 18, 6.30% from 18 to 24, 27.80% from 25 to 44, 22.40% from 45 to 64, and 17.10% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 95.00 males. For every 100 females age 18 and over, there were 93.20 males.

The median income for a household in the county was $41,222, and the median income for a family was $48,946. Males had a median income of $31,220 versus $24,652 for females. The per capita income for the county was $18,884. About 3.40% of families and 5.00% of the population were below the poverty line, including 4.50% of those under age 18 and 5.40% of those age 65 or over.

Politics

In the 2008 US presidential election, a nearly equal number of Iowa County voters voted for each major candidate, with Barack Obama winning the county by a narrow margin of 14 votes.Local and National Election Results - Election Center 2008 , accessed June 16, 2012.

In the 2012 US presidential election, Mitt Romney received 4,551 votes (51.8%). In the 2016 US presidential election, Donald Trump received 5,193 votes (59.1%). In the 2020 US presidential election, Donald Trump received 6,009 votes (61.8%). In the 2024 US presidential election, Donald Trump received 6,068 votes (63.0%).

Communities Cities

Ladora Marengo Millersburg North English Parnell Victor Williamsburg

Census-designated places Amana Conroy East Amana High Amana Homestead Middle Amana South Amana West Amana

Other unincorporated communities Ambrose Armah Genoa Bluff Holbrook Koszta Upper South Amana

Townships

English Greene Hartford Hilton Iowa Lenox Lincoln Marengo Pilot Sumner Troy Washington York

Population ranking Population rankings based on the 2020 census of Iowa County:

† county seat

Rank City/Town/etc. Municipal type Population(2020 Census) Population(2024 Estimate) 1Williamsburg City 3,346 3,380 2† Marengo City 2,435 2,415 3North English (partially in Keokuk County) City 1,065 1,089 4Victor (partially in Poweshiek County) City 875 872 5Middle Amana CDP 543 739 6Amana CDP 388 650 7Conroy CDP 252 273 8Ladora City 229 223 9Parnell City 194 196 10South Amana CDP 165 175 11Homestead CDP 135 168 12Millersburg City 135 148 13West Amana CDP 140 145 14High Amana CDP 113 123 15East Amana CDP 64 73

Education School districts include: - Text list Belle Plaine Community School District, Belle Plaine Benton Community School District, Van Horne Clear Creek–Amana Community School District, Oxford English Valleys Community School District, North English H-L-V Community School District, Victor Iowa Valley Community School District, Marengo Mid-Prairie Community School District, Wellman Tri-County Community School District, Thornburg Williamsburg Community School District, Williamsburg

Iowa County, Iowa

Bron en licentie