Map of Marion County, Indiana

Marion County is located in the U.S. state of Indiana. The 2020 United States census reported a population of 977,203, making it the largest county in the state and 51st most populated county in the country. Indianapolis is the county seat, the state capital, and largest city. Marion County is consolidated with Indianapolis through an arrangement known as Unigov.

Marion County is the central county of the Indianapolis–Carmel–Anderson MSA in Central Indiana.

Marion County overview:
Name:Marion County
FIPS code:18-097
State:Indiana
Founded:April 1, 1822
Named for:Francis Marion
Seat:Indianapolis
Largest city:Indianapolis
Total Area:403.01 sq mi (1,043.8 km²)
Land Area:396.30 sq mi (1,026.4 km²)
Total Population:977,203
Population Density:2,466/sq mi (952/km²)

Marion County location map. Where is Marion County?

Marion County location on the U.S. Map. Where is Marion County.
Location of Marion County in the the United States.
Marion County location on the Indiana map. Where is Marion County.
Location of Marion County in Indiana.

History

Marion County was created on April 1, 1822, from part of the “New Purchase” lands that had been obtained from its inhabitants, the Lenape, by the Treaty of St. Mary’s. It is named for Francis Marion, a brigadier general from South Carolina in the American Revolutionary War.

The state capital was moved to Indianapolis in Marion County from Corydon on January 10, 1825. This began a period of rapid growth in population.

Marion County Road Map

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

Geography

The low rolling hills of Marion County have been cleared of trees, and the area is completely devoted to municipal development or to agriculture, except for wooded drainages. The highest point (920 feet/280 meters ASL) is a small ridge at the county’s northwest corner.

According to the 2010 census, the county has an area of 403.01 square miles (1,043.8 km), of which 396.30 square miles (1,026.4 km) (or 98.34%) is land and 6.71 square miles (17.4 km) (or 1.66%) is water.

The White River flows southwestward through the central part of the county; it is joined by Eagle Creek and Fall Creek, both of which have dams in the county forming Eagle Creek Reservoir and Geist Reservoir, respectively.

Marion County has two Indiana State Parks, Fort Harrison State Park and White River State Park, as well as many municipal parks.

Adjacent counties

Marion County Topographic Map

Topographic Map of Marion County, Indiana
Marion County Topo map.

Marion County Satellite Map

Satellite Map of Marion County, Indiana
Marion County satellite map.

Marion County Outline Map

Outline Map of Marion County, Indiana
Marion County outline map.

See also

Map of Indiana State and its subdivision: Map of other states:
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