Indiana Population by County, 2025 Census Estimates
Indiana population by county: July 2025 Census estimates for all 92 counties, change since 2020, density, and a link to each official parcel map.
Looking for Indiana population by county? The Census Bureau estimates that Indiana had 6,973,333 residents on July 1, 2025, spread across 92 counties. Marion County is the most populous, with 992,196 people (14% of the state), and Ohio County is the least populous, with 5,994.
The table below lists every county with its 2025 estimate, its April 2020 starting point, the change, people per square mile, and a link to its official parcel viewer.
Percent change runs from the April 1, 2020 estimates base to July 1, 2025. People per square mile is the July 2025 estimate divided by the county's land area in the Census Bureau's 2020 Gazetteer file, so lakes and bays are left out.
How Indiana's population is spread out
Grouping the counties by size shows how concentrated the state is:
Residents (July 2025)
Counties
Total residents
Share of state
250,000 to 999,999
5
2,559,034
37%
100,000 to 249,999
12
1,864,842
27%
25,000 to 99,999
45
2,058,916
30%
10,000 to 24,999
25
450,471
6%
Under 10,000
5
40,070
1%
5 counties with at least 250,000 residents hold 37% of the state's population.
Most and least densely populated
The most crowded counties by people per square mile of land:
Marion County: 2,502 per sq mi (992,196 people on 397 sq mi)
Lake County: 1,012 per sq mi (504,612 people on 499 sq mi)
Hamilton County: 981 per sq mi (387,036 people on 394 sq mi)
Vanderburgh County: 780 per sq mi (181,995 people on 233 sq mi)
Allen County: 612 per sq mi (402,329 people on 657 sq mi)
The most thinly settled:
Benton County: 22 per sq mi (8,883 people on 406 sq mi)
Warren County: 23 per sq mi (8,474 people on 365 sq mi)
Pulaski County: 29 per sq mi (12,463 people on 434 sq mi)
Martin County: 29 per sq mi (9,856 people on 336 sq mi)
Crawford County: 34 per sq mi (10,509 people on 306 sq mi)
About these numbers
They are estimates. Between censuses the Census Bureau's Population Estimates Program updates county totals each year from births, deaths and migration records. The next full count is the 2030 census.
The base is April 1, 2020. The estimates start from an April 1, 2020 "estimates base" built from the 2020 census, which is why it is slightly different from the published census count.
Each new release revises the past. A newer vintage can change earlier years as well, so compare numbers from the same release, as this page does.
Statewide total. The counties add up exactly to the statewide figure of 6,973,333 in the same file.
Using population numbers in a land search
Big counties, busy offices. In the most populous counties, parcel maps and deed records are usually online and searchable, but recording and permit offices are busier. Allow for that if you are on a deadline.
Small counties, fewer sales. In counties with only a few thousand people, land changes hands less often, so there are fewer recent sales to compare a price with. Recorded deeds and the local assessor's sales records are the best source.
Density hints at lot size. A low people-per-square-mile figure usually means farms, ranches and timber tracts; a high one means subdivided lots. The parcel viewer shows the actual parcel lines.
Check the official map. Use the parcel viewer link in the table for boundaries, parcel numbers and owner names, then confirm anything important with the local assessor and the office that records deeds.