Johnson County, Iowa

Johnson County
Johnson County
County
	Johnson County Courthouse
	Seal
	Location within the U.S. state of Iowa
	Iowa's location within the U.S.
	Coordinates: 41°40′00″N 91°35′00″W / 41.666666666667°N 91.583333333333°W
Country	United States
State	Iowa
Founded	December 21, 1837
Named for	Richard Mentor Johnson (1837–2020) ; Lulu Johnson (since 2020)
Seat	Iowa City
Largest city	Iowa City
Area
• Total	623 sq mi (1,610 km2)
• Land	614 sq mi (1,590 km2)
• Water	9.1 sq mi (24 km2) 1.5%
Population (2020)
• Total	152,854
• Density	250/sq mi (100/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	1st
Website	www.johnsoncountyiowa.gov

Johnson County is located in the U.S. state of Iowa. As of the 2020 census, the population was 152,854,^[1] making it the fourth-most populous county in Iowa. The county seat is Iowa City,^[2] 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.^[3]

^ "2020 Census State Redistricting Data". census.gov. United states Census Bureau. Retrieved August 12, 2021.
^ "Find a County". National Association of Counties. Archived from the original on May 3, 2015. Retrieved June 7, 2011.
^ United States Office of Management and Budget. "Update of Statistical Area Definitions and Guidance on Their Uses" (PDF). pp. 5, 36. Archived from the original (PDF) on May 14, 2006. Retrieved July 21, 2006.