Grant County, Indiana
A county in Indiana, ranked 26 of 92 by population.
CountyFIPS 18053
- Population
- 66,524
- +19 (0%) since 2020
- Land area
- 414.1
- square miles. A further 0.2% of the total area is water
- Population density
- 161
- people per square mile, computed rather than published
- County seat
- Marion
- Seat of county government.
- Established
- 1831
- 194 years ago
- Largest city
- Marion city
- Population 28,234.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.
Satellite view
Aerial imagery of Grant County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.
Where Grant County ranks
Position among the 92 counties of Indiana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.
| Measure | Value | In Indiana | Nationally |
|---|---|---|---|
| Population | 66,524 | 26th of 92 | 827th of 3,144 |
| Land area | 414.1 sq mi | 30th of 92 | 2,441st of 3,144 |
| Population density | 161 per sq mi | 27th of 92 | 666th of 3,144 |
| Median household income | $53,522 | 89th of 92 | 2,561st of 3,143 |
Full data for Grant County
| Measure | Value | Source and vintage |
|---|---|---|
| Population | 66,524 | Vintage 2025 Population Estimates |
| Population in 2020 | 66,505 | Vintage 2025 Population Estimates |
| 2020 estimates base? | 66,672 | Vintage 2025 Population Estimates |
| Land area | 414.1 sq mi | 2025 Gazetteer Files |
| Water area | 0.81 sq mi | 2025 Gazetteer Files |
| Total area | 414.9 sq mi | 2025 Gazetteer Files |
| Population density? | 161 per sq mi | Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area |
| Median household income | $53,522 | American Community Survey 2020-2024 5-Year Estimates |
| Median home value | $122,300 | American Community Survey 2020-2024 5-Year Estimates |
| Median age | 38.7 | American Community Survey 2020-2024 5-Year Estimates |
| Households | 26,773 | American Community Survey 2020-2024 5-Year Estimates |
| Housing units | 29,907 | American Community Survey 2020-2024 5-Year Estimates |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.
How the population changed
The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:
- Births minus deaths
- -257
- 691 births, 948 deaths
- Net migration
- +547
- More people moved in than moved out.
Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.
The 9 areas bordering Grant County
Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.
| Bordering area | State | Shared border | Population |
|---|---|---|---|
| Madison County | Indiana | 15 mi | 135,088 |
| Blackford County | Indiana | 13 mi | 11,730 |
| Wabash County | Indiana | 12 mi | 30,713 |
| Howard County | Indiana | 11 mi | 83,904 |
| Huntington County | Indiana | 10.0 mi | 37,224 |
| Delaware County | Indiana | 7.1 mi | 113,106 |
| Wells County | Indiana | 6.0 mi | 28,883 |
| Miami County | Indiana | 5.9 mi | 34,487 |
| Tipton County | Indiana | 2.0 mi | 15,319 |
Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.
All 92 counties of Indiana
Open the interactive Indiana county map, or jump straight to any of them.
- Adams County
- Allen County
- Bartholomew County
- Benton County
- Blackford County
- Boone County
- Brown County
- Carroll County
- Cass County
- Clark County
- Clay County
- Clinton County
- Crawford County
- Daviess County
- Dearborn County
- Decatur County
- DeKalb County
- Delaware County
- Dubois County
- Elkhart County
- Fayette County
- Floyd County
- Fountain County
- Franklin County
- Fulton County
- Gibson County
- Grant County
- Greene County
- Hamilton County
- Hancock County
- Harrison County
- Hendricks County
- Henry County
- Howard County
- Huntington County
- Jackson County
- Jasper County
- Jay County
- Jefferson County
- Jennings County
- Johnson County
- Knox County
- Kosciusko County
- LaGrange County
- Lake County
- LaPorte County
- Lawrence County
- Madison County
- Marion County
- Marshall County
- Martin County
- Miami County
- Monroe County
- Montgomery County
- Morgan County
- Newton County
- Noble County
- Ohio County
- Orange County
- Owen County
- Parke County
- Perry County
- Pike County
- Porter County
- Posey County
- Pulaski County
- Putnam County
- Randolph County
- Ripley County
- Rush County
- Scott County
- Shelby County
- Spencer County
- St. Joseph County
- Starke County
- Steuben County
- Sullivan County
- Switzerland County
- Tippecanoe County
- Tipton County
- Union County
- Vanderburgh County
- Vermillion County
- Vigo County
- Wabash County
- Warren County
- Warrick County
- Washington County
- Wayne County
- Wells County
- White County
- Whitley County
Data on this page last rebuilt 30 August 2026. How these figures are produced.