Johnson County
Sign in to saveAlso known as Johnson County, Iowa, Johnson County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Founded
- December 21, 1837 (created), July 4, 1838 (organized)
- Named after
- Richard Mentor Johnson (1837–2020), Lulu Johnson (since 2020)
- Seat
- Iowa City
- Largest city
- Iowa City
- Total
- 623.063 sq mi (1,613.73 km )
- Land
- 612.997 sq mi (1,587.65 km )
- Water
- 10.066 sq mi (26.07 km ) 1.62%
- Estimate 2025
- 160,044
- Density
- 249.355/sq mi (96.2766/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 1st
- Website
- johnsoncountyiowa.gov
via Wikipedia infobox
Wikidata facts
- Named after
- Richard Mentor Johnson
- Country
- United States
- Located in
- Iowa
- Contains
- Iowa City
- Capital
- Iowa City
- Population
- 152854
- Area
- 1614
- Shares border with
- Benton County
- Official website
- www.johnson-county.com
- Image
- Johnson county courhouse iowa.jpg
- Households
- 60430
Show 9 more facts
- Commons category
- Johnson County, Iowa
- topic's main category
- Category:Johnson County, Iowa
- inception
- 1837-12-21
- category for people born here
- Category:Births in Johnson County, Iowa
- category of associated people
- Category:People from Johnson County, Iowa
- water as percent of area
- 1.5
- native label
- Johnson County
- per capita income
- 35875
- P12749
- Benjamin Schmolck
Sources (9)
via Wikidata · CC0
~12 min read
Encyclopedic overview
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.
History
Excerpted from Wikipedia’s “Johnson County” article, available under the CC BY-SA 4.0 licence.