Map of Johnson County, Indiana

Johnson County is a county located in the U.S. state of Indiana. As of 2020, the population was 161,765. The county seat is Franklin.

Johnson County is included in the Indianapolis-Carmel–Anderson, IN Metropolitan Statistical Area.

Johnson County overview:
Name:	Johnson County
FIPS code:	18-081
State:	Indiana
Founded:	1823
Seat:	Franklin
Largest city:	Greenwood
Total Area:	321.79 sq mi (833.4 km²)
Land Area:	320.43 sq mi (829.9 km²)
Total Population:	161,765
Population Density:	436/sq mi (168.4/km²)

Johnson County location map. Where is Johnson County?

Johnson County location on the U.S. Map. Where is Johnson County. — Location of Johnson County in the the United States.

Johnson County location on the Indiana map. Where is Johnson County. — Location of Johnson County in Indiana.

History

Johnson County was formed in 1823. It was named for John Johnson, a Justice of the Indiana Supreme Court. This is probably John Johnson of Knox County, delegate to the State constitutional convention, appointed to the Supreme Court in 1816.

Johnson County Road Map

Johnson CountyStreet Map. — Street map of Johnson County, Indiana. Source: OpenStreetMap (OSM)

Geography

According to the 2010 census, the county has a total area of 321.79 square miles (833.4 km), of which 320.43 square miles (829.9 km) (or 99.58%) is land and 1.36 square miles (3.5 km) (or 0.42%) is water.