Johnson County, Iowa Basics:
Johnson County Iowa - Government Site
Population: 136,428
Area: 614 square miles
County seat: Iowa City
Area code(s) in use: 319
Time zone: CST
High school graduate or higher: 95.1%
Bachelor's degree or higher: 51.2%
Median household income: $53,993
Persons in poverty: 17.6%
Home ownership rate: 60.4%
Mean travel time to work: 17.9 minutes
Adjacent counties:
Benton Cedar Iowa Linn Louisa Muscatine Washington