|Iowa County, Iowa|
Iowa County Courthouse in Marengo
Location in the U.S. state of Iowa
Iowa's location in the U.S.
|Named for||Iowa River|
|• Total||587 sq mi (1,520 km2)|
|• Land||586 sq mi (1,518 km2)|
|• Water||1.0 sq mi (3 km2), 0.2%|
|• ( 2010)||16,355|
|• Density||28/sq mi (11/km2)|
|Time zone||Central: UTC−6/ −5|
Iowa County is one of seven counties in the United States to share the same name as the state they are located in. The other six counties are Arkansas County, Hawaii County, Idaho County, New York County, Oklahoma County, and Utah County. 
The first courthouse was a log cabin built in 1847. This 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.
- Interstate 80
- U.S. Highway 6
- U.S. Highway 151
- Iowa Highway 21
- Iowa Highway 149
- Iowa Highway 220
- Iowa Highway 212
- Benton County (north)
- Linn County (northeast)
- Johnson County (east)
- Washington County (southeast)
- Keokuk County (south)
- Poweshiek County (west)
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2013 
The 2010 census recorded a population of 16,355 in the county, with a population density of 27.8881/sq mi (10.7677/km2). There were 7,258 housing units, of which 6,677 were occupied. 
As of the census  of 2000, there were 15,671 people, 6,163 households, and 4,301 families residing in the county. The population density was 27 people per square mile (10/km²). There were 6,545 housing units at an average density of 11 per square mile (4/km²). The racial makeup of the county was 98.70% White, 0.17% Black or African American, 0.06% Native American, 0.30% Asian, 0.03% Pacific Islander, 0.36% from other races, and 0.38% from two or more races. 0.97% of the population were Hispanic or Latino of any race.
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.
This section needs to be updated.(April 2018)
In the 2008 US presidential election, a nearly equal number of Iowa County voters voted for each major candidate. 
† county seat
|Rank||City/Town/etc.||Municipal type||Population (2010 Census)
|3||North English (partially in Keokuk County)||City||1,041|
|4||Victor (partially in Poweshiek)||City||893|
- "State & County QuickFacts". United States Census Bureau. Archived from the original on July 11, 2011. Retrieved July 17, 2014.
- "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.
- Joseph Nathan Kane; Charles Curry Aiken (2005). The American Counties: Origins of County Names, Dates of Creation, and Population Data, 1950-2000. Scarecrow Press. ISBN 978-0-8108-5036-1.
- Iowa County Archived 2008-07-20 at the Wayback Machine. at Iowa State Association of Counties, retrieved July 26, 2008.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- Ripley, George; Dana, Charles A., eds. (1879). " Iowa. II. An E. county of Iowa". The American Cyclopædia.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "U.S. Decennial Census". United States Census Bureau. Archived from the original on May 12, 2015. Retrieved July 17, 2014.
- "Historical Census Browser". University of Virginia Library. Retrieved July 17, 2014.
- "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 17, 2014.
- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved July 17, 2014.
- "Population & Housing Occupancy Status 2010". United States Census Bureau American FactFinder. Retrieved May 18, 2011.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- Local and National Election Results - Election Center 2008 , accessed 16 June 2012.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 2018-04-26.
- "Archived copy". Archived from the original on 2013-12-21. Retrieved 2017-01-18.
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