| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Miami County | 1 | 6.29% | 36,378 | 34,224 |
| Linn County | 2 | 4.58% | 10,026 | 9,587 |
| Pottawatomie County | 3 | 4.53% | 26,562 | 25,411 |
| Wabaunsee County | 4 | 3.8% | 7,153 | 6,891 |
| Leavenworth County | 5 | 3.35% | 84,710 | 81,966 |
| Butler County | 6 | 2.86% | 69,318 | 67,391 |
| Johnson County | 7 | 2.84% | 628,529 | 611,149 |
| Gray County | 8 | 2.83% | 5,807 | 5,647 |
| Douglas County | 9 | 2.41% | 121,645 | 118,784 |
| Cheyenne County | 10 | 2.22% | 2,672 | 2,614 |
| Jackson County | 11 | 2.12% | 13,520 | 13,239 |
| Osage County | 12 | 2.04% | 16,062 | 15,741 |
| Ottawa County | 13 | 1.97% | 5,842 | 5,729 |
| Wallace County | 14 | 1.92% | 1,541 | 1,512 |
| Sedgwick County | 15 | 1.88% | 534,671 | 524,821 |
| Franklin County | 16 | 1.76% | 26,457 | 26,000 |
| Smith County | 17 | 1.65% | 3,626 | 3,567 |
| Dickinson County | 18 | 1.37% | 18,625 | 18,373 |
| Chase County | 19 | 1.17% | 2,601 | 2,571 |
| Lyon County | 20 | 1.06% | 32,454 | 32,113 |
| Anderson County | 21 | 1.01% | 7,918 | 7,839 |
| Elk County | 22 | 0.93% | 2,505 | 2,482 |
| Doniphan County | 23 | 0.74% | 7,529 | 7,474 |
| Harper County | 24 | 0.6% | 5,505 | 5,472 |
| Woodson County | 25 | 0.39% | 3,111 | 3,099 |
| Russell County | 26 | 0.37% | 6,703 | 6,678 |
| Gove County | 27 | 0.26% | 2,721 | 2,714 |
| Bourbon County | 28 | 0.02% | 14,338 | 14,335 |
| Decatur County | 29 | -0.04% | 2,758 | 2,759 |
| Washington County | 30 | -0.07% | 5,526 | 5,530 |
| McPherson County | 31 | -0.12% | 30,147 | 30,184 |
| Sumner County | 32 | -0.2% | 22,284 | 22,328 |
| Jefferson County | 33 | -0.27% | 18,273 | 18,323 |
| Shawnee County | 34 | -0.3% | 178,164 | 178,709 |
| Ford County | 35 | -0.36% | 34,092 | 34,215 |
| Lincoln County | 36 | -0.37% | 2,938 | 2,949 |
| Pratt County | 37 | -0.47% | 9,100 | 9,143 |
| Ellis County | 38 | -0.68% | 28,750 | 28,948 |
| Reno County | 39 | -0.79% | 61,387 | 61,878 |
| Ellsworth County | 40 | -1% | 6,305 | 6,369 |
| Cherokee County | 41 | -1.02% | 19,112 | 19,309 |
| Coffey County | 42 | -1.29% | 8,249 | 8,357 |
| Riley County | 43 | -1.3% | 71,080 | 72,016 |
| Mitchell County | 44 | -1.32% | 5,697 | 5,773 |
| Haskell County | 45 | -1.6% | 3,700 | 3,760 |
| Republic County | 46 | -1.91% | 4,575 | 4,664 |
| Thomas County | 47 | -1.93% | 7,779 | 7,932 |
| Labette County | 48 | -1.93% | 19,780 | 20,170 |
| Sherman County | 49 | -1.98% | 5,780 | 5,897 |
| Norton County | 50 | -2.07% | 5,340 | 5,453 |
| Marshall County | 51 | -2.08% | 9,815 | 10,023 |
| Allen County | 52 | -2.19% | 12,258 | 12,533 |
| Sheridan County | 53 | -2.21% | 2,391 | 2,445 |
| Clay County | 54 | -2.24% | 7,939 | 8,121 |
| Atchison County | 55 | -2.36% | 15,942 | 16,328 |
| Harvey County | 56 | -2.4% | 33,170 | 33,986 |
| Nemaha County | 57 | -2.42% | 10,014 | 10,262 |
| Crawford County | 58 | -2.43% | 38,002 | 38,948 |
| Marion County | 59 | -2.45% | 11,504 | 11,793 |
| Wyandotte County | 60 | -2.56% | 164,591 | 168,914 |
| Cowley County | 61 | -2.63% | 33,625 | 34,534 |
| Wichita County | 62 | -2.75% | 2,090 | 2,149 |
| Graham County | 63 | -2.87% | 2,334 | 2,403 |
| Greenwood County | 64 | -3.06% | 5,794 | 5,977 |
| Finney County | 65 | -3.09% | 37,120 | 38,304 |
| Morris County | 66 | -3.11% | 5,202 | 5,369 |
| Saline County | 67 | -3.2% | 52,516 | 54,254 |
| Hamilton County | 68 | -3.22% | 2,407 | 2,487 |
| Barton County | 69 | -3.33% | 24,581 | 25,427 |
| Cloud County | 70 | -3.5% | 8,694 | 9,009 |
| Chautauqua County | 71 | -3.51% | 3,267 | 3,386 |
| Trego County | 72 | -3.64% | 2,701 | 2,803 |
| Rooks County | 73 | -3.66% | 4,714 | 4,893 |
| Rice County | 74 | -3.72% | 9,040 | 9,389 |
| Meade County | 75 | -3.79% | 3,907 | 4,061 |
| Pawnee County | 76 | -4.06% | 6,002 | 6,256 |
| Lane County | 77 | -4.4% | 1,499 | 1,568 |
| Montgomery County | 78 | -4.48% | 29,998 | 31,404 |
| Osborne County | 79 | -4.9% | 3,319 | 3,490 |
| Phillips County | 80 | -4.92% | 4,717 | 4,961 |
| Brown County | 81 | -4.94% | 9,004 | 9,472 |
| Ness County | 82 | -4.98% | 2,540 | 2,673 |
| Neosho County | 83 | -5.1% | 15,094 | 15,905 |
| Grant County | 84 | -5.26% | 6,941 | 7,326 |
| Jewell County | 85 | -5.33% | 2,771 | 2,927 |
| Logan County | 86 | -5.48% | 2,589 | 2,739 |
| Comanche County | 87 | -5.54% | 1,585 | 1,678 |
| Barber County | 88 | -5.55% | 3,965 | 4,198 |
| Kearny County | 89 | -5.63% | 3,739 | 3,962 |
| Kiowa County | 90 | -5.82% | 2,312 | 2,455 |
| Morton County | 91 | -6% | 2,538 | 2,700 |
| Seward County | 92 | -6.16% | 20,511 | 21,857 |
| Wilson County | 93 | -6.34% | 8,038 | 8,582 |
| Stafford County | 94 | -6.52% | 3,785 | 4,049 |
| Stevens County | 95 | -6.56% | 4,899 | 5,243 |
| Edwards County | 96 | -7.11% | 2,679 | 2,884 |
| Geary County | 97 | -7.28% | 34,083 | 36,760 |
| Scott County | 98 | -7.53% | 4,752 | 5,139 |
| Kingman County | 99 | -7.74% | 6,850 | 7,425 |
| Rawlins County | 100 | -8.9% | 2,343 | 2,572 |
| Hodgeman County | 101 | -9.56% | 1,571 | 1,737 |
| Rush County | 102 | -11.23% | 2,608 | 2,938 |
| Stanton County | 103 | -15.12% | 1,769 | 2,084 |
| Greeley County | 104 | -15.31% | 1,079 | 1,274 |
| Clark County | 105 | -15.97% | 1,663 | 1,979 |
Kansas's counties show varied growth patterns from 2020 to 2025. Miami County leads with 6.29% annualized growth, followed by Linn County (4.58%) and Pottawatomie County (4.53%). The largest counties are Johnson County (628,529), Sedgwick County (534,671), and Shawnee County (178,164). Of the 105 counties in Kansas, 28 are growing while 77 have experienced population decline. Overall, counties averaged -2.38% annualized growth, with total population growing by 0.34% annually.