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Johnson County is located in the U.S. state of Iowa. As of the 2020 United States Census, 2020 census, the population was 152,854, making it the fourth-most populous county in Iowa. The county seat is Iowa City, Iowa, Iowa City, home of the University of Iowa. Johnson County is included in the Iowa City metropolitan area, which is also included in the Cedar Rapids, Iowa metropolitan area, Cedar Rapids-Iowa City Corridor Combined Statistical Area.
Interstate 80 in Iowa, Interstate 80
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Interstate 380 (Iowa), Interstate 380
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U.S. Route 6 in Iowa, U.S. Highway 6
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U.S. Route 218, U.S. Highway 218
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Iowa Highway 1
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Iowa Highway 22
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Iowa Highway 27
As of the census of 2000, there were 111,006 people, 44,080 households, and 23,582 families residing in the county. The population density was . There were 45,831 housing units at an average density of 75 per square mile (29/km2). The racial makeup of the county was 90.13% Race (United States Census), White, 2.90% Race (United States Census), Black or Race (United States Census), African American, 0.28% Race (United States Census), Native American, 4.12% Race (United States Census), Asian, 0.04% Race (United States Census), Pacific Islander, 1.01% from Race (United States Census), other races, and 1.51% from two or more races. 2.51% of the population were Race (United States Census), Hispanic or Race (United States Census), Latino of any race.
There were 44,080 households, out of which 26.50% had children under the age of 18 living with them, 43.90% were Marriage, married couples living together, 6.80% had a female householder with no husband present, and 46.50% were non-families. 30.20% of all households were made up of individuals, and 5.60% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.97.
Age spread: 20.10% under the age of 18, 23.40% from 18 to 24, 30.80% from 25 to 44, 18.20% from 45 to 64, and 7.40% who were 65 years of age or older. The median age was 28 years. For every 100 females, there were 99.10 males. For every 100 females age 18 and over, there were 97.30 males.
The median income for a household in the county was $40,060, and the median income for a family was $60,112. Males had a median income of $36,279 versus $29,793 for females. The per capita income for the county was $22,220. About 5.20% of families and 15.00% of the population were below the poverty line, including 8.10% of those under age 18 and 3.80% of those age 65 or over.
Johnson County GovernmentJohnson County Crisis CenterJohnson County website
{{Coord, 41, 40, N, 91, 35, W, region:US-IA_type:adm2nd_source:dewiki, display=title Johnson County, Iowa, 1837 establishments in Wisconsin Territory Populated places established in 1837 Iowa City metropolitan area
History
Johnson County was established in December 1837 by the legislature of the Wisconsin Territory, one of thirteen counties established by that body in a comprehensive act. The county's area was partitioned from Dubuque County, Iowa, Dubuque County, and was not initially provided with a civil government, instead being governed by Cedar County, Iowa, Cedar County officials. It was originally named for the US Vice President Richard Mentor Johnson, Richard M. Johnson. In 2020, the Johnson County Board of Supervisors voted unanimously to change the county's namesake to be Lulu Johnson, Lulu Merle Johnson, the first black woman in the state to get her doctorate. The first courthouse in the county was a two-story log cabin structure, built in 1838 in the settlement of Napoleon, about two miles south of the current courthouse.Aurner, p. 492. The building stood across from what later would become the National Register of Historic Places listings in Johnson County, Iowa, James McCollister Farmstead on land later owned by Philip Clark. After Iowa City was established by fiat as the new territorial capitol of Iowa, the county seat was removed there. The second Johnson County Courthouse, the first in Iowa City, was built on Lot 8 Block 8 of the County Seat Addition to Iowa City in 1842 for $3,690. This location was in the southeast corner of the intersection of Harrison and Clinton Streets. The building was 56 x 28 feet and two stories tall. It was built by James Trimble, who had previously built the first jail. A third courthouse was built in 1857 in the courthouse square on Clinton Street between Court and Harrison Streets. It was used until 1901, after cracks appeared in its south wall in 1899. The building was apparently built of brick with stone and wood ornamentation. The Richardsonian Romanesque style courthouse in use today was designed by the firm of Rush, Bowman and Rush of Grand Rapids, Michigan. It was bid at a cost of $111,000 and built by the firm Rowson & Son of Johnson County. The cornerstone was laid in December 1899. The building's tower was based on Henry Hobson Richardson's design for the spire of Trinity Church, Boston, Trinity Church in Boston. The building was dedicated on June 8, 1901. The currently unused jail that stands to the west of the courthouse was designed by C.L. Wundt of Burlington, Iowa on behalf of the Stewart Iron Works in Cleveland and bid for $14,000.Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.5%) is water.Major highways
* Interstate 80 in Iowa, Interstate 80
* Interstate 380 (Iowa), Interstate 380
* U.S. Route 6 in Iowa, U.S. Highway 6
* U.S. Route 218, U.S. Highway 218
* Iowa Highway 1
* Iowa Highway 22
* Iowa Highway 27
Transit
* Cambus * Iowa City Transit * List of intercity bus stops in IowaAdjacent counties
*Benton County, Iowa, Benton County – northwest *Cedar County, Iowa, Cedar County – east *Iowa County, Iowa, Iowa County – west *Linn County, Iowa, Linn County – north *Muscatine County, Iowa, Muscatine County – east and southeast *Louisa County, Iowa, Louisa County – southeast and south *Washington County, Iowa, Washington County – southDemographics
2020 census
The 2020 census recorded a population of 152,854 in the county, with a population density of . 93.62% of the population reported being of one race. There were 65,916 housing units, of which 61,335 were occupied.2010 census
The 2010 census recorded a population of 130,882 in the county, with a population density of . There were 55,967 housing units, of which 52,715 were occupied.2000 census
As of the census of 2000, there were 111,006 people, 44,080 households, and 23,582 families residing in the county. The population density was . There were 45,831 housing units at an average density of 75 per square mile (29/km2). The racial makeup of the county was 90.13% Race (United States Census), White, 2.90% Race (United States Census), Black or Race (United States Census), African American, 0.28% Race (United States Census), Native American, 4.12% Race (United States Census), Asian, 0.04% Race (United States Census), Pacific Islander, 1.01% from Race (United States Census), other races, and 1.51% from two or more races. 2.51% of the population were Race (United States Census), Hispanic or Race (United States Census), Latino of any race.
There were 44,080 households, out of which 26.50% had children under the age of 18 living with them, 43.90% were Marriage, married couples living together, 6.80% had a female householder with no husband present, and 46.50% were non-families. 30.20% of all households were made up of individuals, and 5.60% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.97.
Age spread: 20.10% under the age of 18, 23.40% from 18 to 24, 30.80% from 25 to 44, 18.20% from 45 to 64, and 7.40% who were 65 years of age or older. The median age was 28 years. For every 100 females, there were 99.10 males. For every 100 females age 18 and over, there were 97.30 males.
The median income for a household in the county was $40,060, and the median income for a family was $60,112. Males had a median income of $36,279 versus $29,793 for females. The per capita income for the county was $22,220. About 5.20% of families and 15.00% of the population were below the poverty line, including 8.10% of those under age 18 and 3.80% of those age 65 or over.
Politics
Largely due to the presence of the University of Iowa, Johnson County is considered the most liberal county in Iowa and a stronghold of the Democratic Party (United States), Democratic Party, and has always been among Iowa's most Democratic counties since the Civil War. It has been the strongest Democratic county in the state since United States presidential election in Iowa, 1984, 1984. This trend predates the recent swing toward the Democrats in counties influenced by college towns. The last Republican Party (United States), Republican to win the county in a presidential election was Richard Nixon in 1960, and the last Republican to even get 40 percent of the county's vote was Ronald Reagan in 1984. As a measure of how strongly Democratic the county has been, Democrats easily carried it even in the national Republican landslides of 1972, 1984 and 1988, and the county was the only county in Iowa to vote for Democrat Alton B. Parker over Republican Theodore Roosevelt in 1904 United States presidential election in Iowa, 1904. In 2020, Joe Biden received the highest percentage of the vote received by any Democrat in the county's history; indeed, by any candidate of any party. Johnson County's Democratic bent is just as pronounced at the state level. It is often the lone county to vote Democratic in statewide Republican landslides, such as Senator Chuck Grassley's re-elections in United States Senate election in Iowa, 2010, 2010 and United States Senate election in Iowa, 2016, 2016 or Governor Terry Branstad's re-election in Iowa gubernatorial election, 2014, 2014.Communities
Cities
*Coralville, Iowa, Coralville *Hills, Iowa, Hills *Iowa City, Iowa, Iowa City *Lone Tree, Iowa, Lone Tree *North Liberty, Iowa, North Liberty *Oxford, Iowa, Oxford *Shueyville, Iowa, Shueyville *Solon, Iowa, Solon *Swisher, Iowa, Swisher *Tiffin, Iowa, Tiffin *University Heights, Iowa, University HeightsCensus-designated place
*Frytown, Iowa, FrytownOther unincorporated communities
*Amish, Iowa, Amish *Elmira, Iowa, Elmira *Cosgrove, Iowa, Cosgrove *Morse, Iowa, Morse *Oasis, Iowa, Oasis *River Junction, Iowa, River Junction *Sharon Center, Iowa, Sharon Center *Sutliff, Iowa, Sutliff *Windham, Iowa, WindhamGhost towns
*Midway, Johnson County, Iowa, MidwayTownships
*Big Grove Township, Johnson County, Iowa, Big Grove *Cedar Township, Johnson County, Iowa, Cedar *Clear Creek Township, Johnson County, Iowa, Clear Creek *East Lucas Township, Johnson County, Iowa, East Lucas *Fremont Township, Johnson County, Iowa, Fremont *Graham Township, Johnson County, Iowa, Graham *Hardin Township, Johnson County, Iowa, Hardin *Jefferson Township, Johnson County, Iowa, Jefferson *Liberty Township, Johnson County, Iowa, Liberty *Lincoln Township, Johnson County, Iowa, Lincoln *Madison Township, Johnson County, Iowa, Madison *Monroe Township, Johnson County, Iowa, Monroe *Newport Township, Johnson County, Iowa, Newport *Oxford Township, Johnson County, Iowa, Oxford *Penn Township, Johnson County, Iowa, Penn *Pleasant Valley Township, Johnson County, Iowa, Pleasant Valley *Scott Township, Johnson County, Iowa, Scott *Sharon Township, Johnson County, Iowa, Sharon *Union Township, Johnson County, Iowa, Union *Washington Township, Johnson County, Iowa, Washington *West Lucas Township, Johnson County, Iowa, West LucasPopulation ranking
The population ranking of the following table is based on the 2020 United States census, 2020 census of Johnson County. † ''county seat''Notable natives
*John T. Struble (1831–1916) early builder and farmer. *Grant Wood, artist.See also
*National Register of Historic Places listings in Johnson County, Iowa *Secrest Octagon BarnReferences
*Charles Ray Aurner, ''Leading Events in Johnson County, Iowa, History, Volume I'' (1912) reproduction by Torch Press, Cedar Rapids IAExternal links
Johnson County Government
{{Coord, 41, 40, N, 91, 35, W, region:US-IA_type:adm2nd_source:dewiki, display=title Johnson County, Iowa, 1837 establishments in Wisconsin Territory Populated places established in 1837 Iowa City metropolitan area