| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Boone County | 1 | 14.36% | 81,351 | 71,133 |
| Hancock County | 2 | 14.05% | 91,444 | 80,180 |
| Hamilton County | 3 | 10.83% | 386,820 | 349,031 |
| Hendricks County | 4 | 10.54% | 194,117 | 175,615 |
| Johnson County | 5 | 6.57% | 172,923 | 162,263 |
| Clark County | 6 | 6.5% | 129,272 | 121,377 |
| Allen County | 7 | 4.49% | 403,459 | 386,123 |
| Madison County | 8 | 4.25% | 135,698 | 130,160 |
| Warrick County | 9 | 4.17% | 66,665 | 63,994 |
| Morgan County | 10 | 3.77% | 74,550 | 71,842 |
| Putnam County | 11 | 3.67% | 38,030 | 36,682 |
| Bartholomew County | 12 | 3.67% | 85,234 | 82,215 |
| Tippecanoe County | 13 | 3.45% | 192,818 | 186,391 |
| Jackson County | 14 | 3.39% | 48,053 | 46,479 |
| Newton County | 15 | 3.17% | 14,229 | 13,792 |
| Daviess County | 16 | 3.07% | 34,393 | 33,368 |
| Floyd County | 17 | 3.06% | 82,980 | 80,515 |
| Fountain County | 18 | 3.03% | 16,992 | 16,493 |
| Carroll County | 19 | 2.92% | 20,924 | 20,331 |
| Wells County | 20 | 2.84% | 28,960 | 28,160 |
| Owen County | 21 | 2.83% | 21,927 | 21,324 |
| Switzerland County | 22 | 2.76% | 10,011 | 9,742 |
| Benton County | 23 | 2.73% | 8,945 | 8,707 |
| DeKalb County | 24 | 2.72% | 44,483 | 43,306 |
| Spencer County | 25 | 2.69% | 20,366 | 19,833 |
| Adams County | 26 | 2.33% | 36,699 | 35,865 |
| Parke County | 27 | 2.26% | 16,533 | 16,167 |
| Shelby County | 28 | 2.13% | 46,027 | 45,066 |
| Scott County | 29 | 2.06% | 24,877 | 24,376 |
| Montgomery County | 30 | 1.98% | 38,695 | 37,943 |
| Whitley County | 31 | 1.88% | 34,984 | 34,340 |
| LaGrange County | 32 | 1.81% | 41,265 | 40,533 |
| Porter County | 33 | 1.78% | 176,431 | 173,338 |
| Vermillion County | 34 | 1.75% | 15,669 | 15,400 |
| Greene County | 35 | 1.63% | 31,306 | 30,805 |
| Delaware County | 36 | 1.52% | 113,454 | 111,757 |
| Dearborn County | 37 | 1.38% | 51,456 | 50,756 |
| Noble County | 38 | 1.36% | 48,114 | 47,468 |
| Franklin County | 39 | 1.36% | 23,098 | 22,789 |
| Jasper County | 40 | 1.29% | 33,318 | 32,893 |
| Lake County | 41 | 1.27% | 505,319 | 498,963 |
| Ohio County | 42 | 1.25% | 5,999 | 5,925 |
| Huntington County | 43 | 1.17% | 37,070 | 36,642 |
| Steuben County | 44 | 1.16% | 34,848 | 34,447 |
| Marshall County | 45 | 1.15% | 46,605 | 46,073 |
| Marion County | 46 | 1.12% | 987,602 | 976,706 |
| Perry County | 47 | 1% | 19,349 | 19,157 |
| Washington County | 48 | 0.95% | 28,501 | 28,233 |
| Kosciusko County | 49 | 0.92% | 80,897 | 80,161 |
| White County | 50 | 0.88% | 24,891 | 24,674 |
| Howard County | 51 | 0.86% | 84,307 | 83,587 |
| Brown County | 52 | 0.83% | 15,609 | 15,480 |
| Starke County | 53 | 0.82% | 23,592 | 23,399 |
| Ripley County | 54 | 0.81% | 29,220 | 28,985 |
| Crawford County | 55 | 0.78% | 10,604 | 10,522 |
| Lawrence County | 56 | 0.76% | 45,350 | 45,009 |
| Harrison County | 57 | 0.69% | 39,945 | 39,673 |
| Martin County | 58 | 0.57% | 9,866 | 9,810 |
| Henry County | 59 | 0.53% | 49,169 | 48,910 |
| Elkhart County | 60 | 0.43% | 207,909 | 207,009 |
| Orange County | 61 | 0.42% | 19,937 | 19,853 |
| St. Joseph County | 62 | 0.42% | 273,830 | 272,688 |
| Gibson County | 63 | 0.3% | 33,157 | 33,058 |
| Jennings County | 64 | 0.27% | 27,654 | 27,579 |
| Vanderburgh County | 65 | 0.27% | 180,832 | 180,345 |
| Fayette County | 66 | 0.25% | 23,414 | 23,356 |
| Grant County | 67 | 0.16% | 66,613 | 66,507 |
| Vigo County | 68 | 0.14% | 106,279 | 106,133 |
| Wayne County | 69 | 0.05% | 66,547 | 66,514 |
| Clay County | 70 | 0.01% | 26,429 | 26,427 |
| Decatur County | 71 | -0.11% | 26,447 | 26,476 |
| Dubois County | 72 | -0.15% | 43,580 | 43,644 |
| Monroe County | 73 | -0.21% | 140,352 | 140,645 |
| Tipton County | 74 | -0.23% | 15,353 | 15,388 |
| Warren County | 75 | -0.25% | 8,404 | 8,425 |
| Posey County | 76 | -0.39% | 25,087 | 25,185 |
| Rush County | 77 | -0.39% | 16,703 | 16,769 |
| Randolph County | 78 | -0.41% | 24,314 | 24,415 |
| Wabash County | 79 | -0.43% | 30,792 | 30,926 |
| Miami County | 80 | -0.44% | 35,749 | 35,906 |
| Sullivan County | 81 | -0.5% | 20,714 | 20,819 |
| Jefferson County | 82 | -0.6% | 32,904 | 33,103 |
| Clinton County | 83 | -0.79% | 32,911 | 33,172 |
| Pike County | 84 | -0.89% | 12,143 | 12,252 |
| Pulaski County | 85 | -0.89% | 12,408 | 12,520 |
| LaPorte County | 86 | -1.05% | 111,110 | 112,287 |
| Jay County | 87 | -1.08% | 20,259 | 20,481 |
| Cass County | 88 | -1.26% | 37,316 | 37,794 |
| Knox County | 89 | -1.49% | 35,717 | 36,257 |
| Blackford County | 90 | -2.91% | 11,757 | 12,109 |
| Fulton County | 91 | -3.81% | 19,689 | 20,468 |
| Union County | 92 | -4% | 6,796 | 7,079 |
Indiana's counties show varied growth patterns from 2020 to 2025. Boone County leads with 14.36% annualized growth, followed by Hancock County (14.05%) and Hamilton County (10.83%). The largest counties are Marion County (987,602), Lake County (505,319), and Allen County (403,459). Of the 92 counties in Indiana, 70 are growing while 22 have experienced population decline. Overall, counties averaged 1.63% annualized growth, with total population growing by 2.62% annually.
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