Johnson County | |
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![]() Johnson County courthouse in Franklin, Indiana | |
![]() Location within the U.S. state of Indiana | |
![]() Indiana's location within the U.S. | |
Coordinates: 39°29′N 86°06′W / 39.49°N 86.1°W | |
Country | ![]() |
State | ![]() |
Founded | 1823 |
Seat | Franklin |
Largest city | Greenwood |
Area | |
• Total | 321.79 sq mi (833.4 km2) |
• Land | 320.43 sq mi (829.9 km2) |
• Water | 1.36 sq mi (3.5 km2) 0.42% |
Population (2020) | |
• Total | 161,765 |
• Estimate (2023) | 167,819 ![]() |
• Density | 500/sq mi (190/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional district | 6th |
Website | www |
Indiana county number 41 |
Johnson County is a county located in the U.S. state of Indiana. As of 2020, the population was 161,765.[1] The county seat is Franklin.[2] Johnson County is included in the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area.