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Johnson County is located in the U.S. state of Iowa. As of the 2020 census, the population was 152,854, and was estimated to be 160,044 in 2025, making it the fourth-most populous county in Iowa. The county seat and the largest city is 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 City Corridor Combined Statistical Area.
Description adapted from Wikipedia, CC BY-SA 4.0.
Johnson County was established on December 21, 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 and was not initially provided with a civil government, instead being governed by Cedar County officials. It was originally named for the United States Vice President Richard M. Johnson (1780–1850). In 2020, the Johnson County Board of Supervisors voted unanimously to change the county's namesake to be Lulu Merle Johnson (1907–1995), the first black woman in the state to earn a doctorate. Vice President Johnson had a common law enslaved wife (Julia Chinn) whom he could not marry since it was against the law at that time to have an interracial marriage. They had two children together and she was in charge of his plantation when he was away on business.
Adapted from Wikipedia, CC BY-SA 4.0.
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