Johnson County | |
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![]() 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 | ![]() |
State | ![]() |
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 ![]() |
• Estimate (2023)[1] | 157,528 ![]() |
• Density | 250/sq mi (100/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 1st |
Website | www |
Johnson County is located in the U.S. state of Iowa. As of the 2020 census, the population was 152,854,[2] making it the fourth-most populous county in Iowa. The county seat is Iowa City,[3] 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.[4]