Indiana Population By County in 2021 (ACS-5Yrs)
Updated on July 2, 2024.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Indiana was 6.75M. Among all Indiana counties, Marion was the most populated county (969.54K), followed by Lake (495.93K), and then Allen (381.84K).
On the other hand, the least populated counties were: Ohio (5.93K), Union (7.10K), and Warren (8.43K).
The chart and table below shows the population of each county and the percentage of Indiana population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Indiana ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Indiana Population By County in 2021
Indiana Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adams | 35685 | 0.53 |
| Allen | 381839 | 5.66 |
| Bartholomew | 81759 | 1.21 |
| Benton | 8687 | 0.13 |
| Blackford | 12139 | 0.18 |
| Boone | 69839 | 1.03 |
| Brown | 15444 | 0.23 |
| Carroll | 20288 | 0.30 |
| Cass | 37918 | 0.56 |
| Clark | 120185 | 1.78 |
| Clay | 26397 | 0.39 |
| Clinton | 33010 | 0.49 |
| Crawford | 10511 | 0.16 |
| Daviess | 33281 | 0.49 |
| Dearborn | 50494 | 0.75 |
| Decatur | 26466 | 0.39 |
| DeKalb | 43059 | 0.64 |
| Delaware | 112480 | 1.67 |
| Dubois | 43474 | 0.64 |
| Elkhart | 206314 | 3.06 |
| Fayette | 23393 | 0.35 |
| Floyd | 79594 | 1.18 |
| Fountain | 16422 | 0.24 |
| Franklin | 22769 | 0.34 |
| Fulton | 20400 | 0.30 |
| Gibson | 33017 | 0.49 |
| Grant | 66802 | 0.99 |
| Greene | 30924 | 0.46 |
| Hamilton | 341616 | 5.06 |
| Hancock | 78616 | 1.16 |
| Harrison | 39516 | 0.59 |
| Hendricks | 172100 | 2.55 |
| Henry | 48857 | 0.72 |
| Howard | 83349 | 1.24 |
| Huntington | 36572 | 0.54 |
| Jackson | 45948 | 0.68 |
| Jasper | 33006 | 0.49 |
| Jay | 20570 | 0.31 |
| Jefferson | 33000 | 0.49 |
| Jennings | 27619 | 0.41 |
| Johnson | 159739 | 2.37 |
| Knox | 36362 | 0.54 |
| Kosciusko | 80151 | 1.19 |
| LaGrange | 40085 | 0.59 |
| Lake | 495925 | 7.35 |
| LaPorte | 112184 | 1.66 |
| Lawrence | 45133 | 0.67 |
| Madison | 130037 | 1.93 |
| Marion | 969542 | 14.36 |
| Marshall | 46175 | 0.68 |
| Martin | 9885 | 0.15 |
| Miami | 36100 | 0.54 |
| Monroe | 140189 | 2.08 |
| Montgomery | 37967 | 0.56 |
| Morgan | 71394 | 1.06 |
| Newton | 13865 | 0.21 |
| Noble | 47293 | 0.70 |
| Ohio | 5931 | 0.09 |
| Orange | 19752 | 0.29 |
| Owen | 21280 | 0.32 |
| Parke | 16316 | 0.24 |
| Perry | 19151 | 0.28 |
| Pike | 12220 | 0.18 |
| Porter | 172353 | 2.55 |
| Posey | 25301 | 0.38 |
| Pulaski | 12496 | 0.19 |
| Putnam | 36838 | 0.55 |
| Randolph | 24681 | 0.37 |
| Ripley | 28953 | 0.43 |
| Rush | 16706 | 0.25 |
| St. Joseph | 272049 | 4.03 |
| Scott | 24290 | 0.36 |
| Shelby | 44825 | 0.66 |
| Spencer | 19949 | 0.30 |
| Starke | 23275 | 0.35 |
| Steuben | 34379 | 0.51 |
| Sullivan | 20814 | 0.31 |
| Switzerland | 9870 | 0.15 |
| Tippecanoe | 185961 | 2.75 |
| Tipton | 15290 | 0.23 |
| Union | 7098 | 0.11 |
| Vanderburgh | 179695 | 2.66 |
| Vermillion | 15477 | 0.23 |
| Vigo | 106523 | 1.58 |
| Wabash | 31120 | 0.46 |
| Warren | 8430 | 0.13 |
| Warrick | 63575 | 0.94 |
| Washington | 28025 | 0.42 |
| Wayne | 66588 | 0.99 |
| Wells | 28103 | 0.42 |
| White | 24593 | 0.36 |
| Whitley | 34048 | 0.50 |