| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Boone County | 1 | 17.99% | 83,929 | 71,133 |
| Hancock County | 2 | 17.33% | 94,078 | 80,180 |
| Hamilton County | 3 | 12.87% | 393,936 | 349,031 |
| Hendricks County | 4 | 12.52% | 197,605 | 175,615 |
| Johnson County | 5 | 7.99% | 175,232 | 162,263 |
| Clark County | 6 | 7.98% | 131,065 | 121,377 |
| Allen County | 7 | 5.57% | 407,623 | 386,123 |
| Madison County | 8 | 5.39% | 137,174 | 130,160 |
| Morgan County | 9 | 4.78% | 75,275 | 71,842 |
| Jackson County | 10 | 4.75% | 48,686 | 46,479 |
| Warrick County | 11 | 4.68% | 66,991 | 63,994 |
| Floyd County | 12 | 4.36% | 84,029 | 80,515 |
| Putnam County | 13 | 4.29% | 38,256 | 36,682 |
| Bartholomew County | 14 | 4.27% | 85,727 | 82,215 |
| Tippecanoe County | 15 | 4.07% | 193,986 | 186,391 |
| Fountain County | 16 | 3.99% | 17,151 | 16,493 |
| Daviess County | 17 | 3.96% | 34,689 | 33,368 |
| Newton County | 18 | 3.88% | 14,327 | 13,792 |
| Benton County | 19 | 3.79% | 9,037 | 8,707 |
| Carroll County | 20 | 3.79% | 21,101 | 20,331 |
| Spencer County | 21 | 3.56% | 20,540 | 19,833 |
| Wells County | 22 | 3.42% | 29,122 | 28,160 |
| Owen County | 23 | 3.18% | 22,003 | 21,324 |
| DeKalb County | 24 | 3.07% | 44,636 | 43,306 |
| Switzerland County | 25 | 3% | 10,034 | 9,742 |
| Shelby County | 26 | 2.96% | 46,400 | 45,066 |
| Vermillion County | 27 | 2.74% | 15,822 | 15,400 |
| Adams County | 28 | 2.65% | 36,814 | 35,865 |
| Scott County | 29 | 2.57% | 25,003 | 24,376 |
| Parke County | 30 | 2.42% | 16,558 | 16,167 |
| Whitley County | 31 | 2.16% | 35,083 | 34,340 |
| LaGrange County | 32 | 2.16% | 41,408 | 40,533 |
| Montgomery County | 33 | 2.15% | 38,757 | 37,943 |
| Porter County | 34 | 2.11% | 177,002 | 173,338 |
| Noble County | 35 | 2% | 48,417 | 47,468 |
| Delaware County | 36 | 1.97% | 113,957 | 111,757 |
| Greene County | 37 | 1.91% | 31,393 | 30,805 |
| Lake County | 38 | 1.75% | 507,683 | 498,963 |
| Marion County | 39 | 1.73% | 993,576 | 976,706 |
| Crawford County | 40 | 1.55% | 10,685 | 10,522 |
| Huntington County | 41 | 1.51% | 37,196 | 36,642 |
| Washington County | 42 | 1.5% | 28,657 | 28,233 |
| Marshall County | 43 | 1.46% | 46,746 | 46,073 |
| Dearborn County | 44 | 1.42% | 51,477 | 50,756 |
| Starke County | 45 | 1.38% | 23,721 | 23,399 |
| Ohio County | 46 | 1.3% | 6,002 | 5,925 |
| Kosciusko County | 47 | 1.2% | 81,125 | 80,161 |
| Franklin County | 48 | 1.19% | 23,060 | 22,789 |
| Perry County | 49 | 1.15% | 19,378 | 19,157 |
| Howard County | 50 | 1.13% | 84,532 | 83,587 |
| Steuben County | 51 | 1.12% | 34,834 | 34,447 |
| White County | 52 | 1.11% | 24,949 | 24,674 |
| Lawrence County | 53 | 1.11% | 45,508 | 45,009 |
| Jasper County | 54 | 1.08% | 33,249 | 32,893 |
| Orange County | 55 | 0.99% | 20,050 | 19,853 |
| Ripley County | 56 | 0.83% | 29,226 | 28,985 |
| Henry County | 57 | 0.71% | 49,257 | 48,910 |
| Elkhart County | 58 | 0.66% | 208,382 | 207,009 |
| Gibson County | 59 | 0.66% | 33,276 | 33,058 |
| Harrison County | 60 | 0.6% | 39,912 | 39,673 |
| Martin County | 61 | 0.59% | 9,868 | 9,810 |
| Fayette County | 62 | 0.59% | 23,493 | 23,356 |
| Brown County | 63 | 0.57% | 15,568 | 15,480 |
| Vanderburgh County | 64 | 0.52% | 181,277 | 180,345 |
| St. Joseph County | 65 | 0.45% | 273,916 | 272,688 |
| Grant County | 66 | 0.39% | 66,768 | 66,507 |
| Jennings County | 67 | 0.34% | 27,674 | 27,579 |
| Wayne County | 68 | 0.26% | 66,684 | 66,514 |
| Vigo County | 69 | 0.24% | 106,392 | 106,133 |
| Clay County | 70 | 0.03% | 26,434 | 26,427 |
| Decatur County | 71 | -0.01% | 26,473 | 26,476 |
| Tipton County | 72 | -0.04% | 15,382 | 15,388 |
| Miami County | 73 | -0.06% | 35,885 | 35,906 |
| Dubois County | 74 | -0.26% | 43,531 | 43,644 |
| Posey County | 75 | -0.31% | 25,107 | 25,185 |
| Wabash County | 76 | -0.38% | 30,807 | 30,926 |
| Monroe County | 77 | -0.46% | 140,002 | 140,645 |
| Randolph County | 78 | -0.51% | 24,291 | 24,415 |
| Jay County | 79 | -0.62% | 20,354 | 20,481 |
| Jefferson County | 80 | -0.65% | 32,887 | 33,103 |
| Pike County | 81 | -0.67% | 12,170 | 12,252 |
| Rush County | 82 | -0.73% | 16,647 | 16,769 |
| Clinton County | 83 | -0.74% | 32,927 | 33,172 |
| Sullivan County | 84 | -0.76% | 20,660 | 20,819 |
| Warren County | 85 | -0.81% | 8,357 | 8,425 |
| Pulaski County | 86 | -1% | 12,395 | 12,520 |
| LaPorte County | 87 | -1.26% | 110,872 | 112,287 |
| Cass County | 88 | -1.91% | 37,073 | 37,794 |
| Knox County | 89 | -1.92% | 35,562 | 36,257 |
| Blackford County | 90 | -3.39% | 11,698 | 12,109 |
| Union County | 91 | -5.24% | 6,708 | 7,079 |
| Fulton County | 92 | -5.34% | 19,374 | 20,468 |
Indiana's counties show varied growth patterns from 2020 to 2026. Boone County leads with 2.8% annualized growth, followed by Hancock County (2.7%) and Hamilton County (2.04%). The largest counties are Marion County (993,576), Lake County (507,683), and Allen County (407,623). Of the 92 counties in Indiana, 70 are growing while 22 have experienced population decline. Overall, counties averaged 0.33% annualized growth, with total population growing by 0.54% annually.
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