Marion County
Also known as Marion County, Indiana, Marion County, IN
county in Indiana, United States
Key facts
- Country
- United States
- State
- Indiana
- Founded
- April 1, 1822
- Named after
- Francis Marion
- Seat
- Indianapolis
- Largest city
- Indianapolis
- Total
- 403.01 sq mi (1,043.8 km )
- Land
- 396.30 sq mi (1,026.4 km )
- Water
- 6.71 sq mi (17.4 km )
- Estimate 2025
- 992,196
- Density
- 2,465.8/sq mi (952.06/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
Article
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 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. Marion County is consolidated with Indianapolis through an entity known as Unigov.
Geography