Marion County, Indiana

For counties with a similar name, see Marion County (disambiguation).

Marion County
County
City-County Building
City-County Building
Map of Indiana highlighting Marion County
Location within the U.S. state of Indiana
Map of the United States highlighting Indiana
Indiana's location within the U.S.
Coordinates: 39°47′N 86°08′W / 39.78°N 86.14°W / 39.78; -86.14
Country United States
State Indiana
FoundedApril 1, 1822
Named forFrancis Marion
SeatIndianapolis
Largest cityIndianapolis
Area
 • Total403.01 sq mi (1,043.8 km2)
 • Land396.30 sq mi (1,026.4 km2)
 • Water6.71 sq mi (17.4 km2)
Population
 (2020)
 • Total977,203
 • Estimate 
(2023)
968,460 Decrease
 • Density2,400/sq mi (940/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts6th, 7th
Websitewww.indy.gov/eGov/County
  • Indiana county number 49
  • Most populous county in Indiana
  • Currently only Unigov county in Indiana

Marion County is located in the U.S. state of Indiana. The 2020 United States census reported a population of 977,203,[1] making it the 54th-most populous county in the U.S., the most populous county in the state, and the main population center of the 11-county Indianapolis–Carmel–Greenwood MSA in central Indiana. Indianapolis is the county seat, the state capital, and most populous city.[2] Marion County is consolidated with Indianapolis through an arrangement known as Unigov.

  1. ^ "Marion County QuickFacts". US Census Bureau. Retrieved January 31, 2022.
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.