| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Pottawatomie County | 1 | 8.63% | 27,616 | 25,421 |
| Miami County | 2 | 6.8% | 36,545 | 34,219 |
| Johnson County | 3 | 5.69% | 645,940 | 611,161 |
| Leavenworth County | 4 | 5.59% | 86,540 | 81,961 |
| Stanton County | 5 | 4.99% | 2,189 | 2,085 |
| Sedgwick County | 6 | 4.36% | 547,735 | 524,837 |
| Wabaunsee County | 7 | 4.35% | 7,190 | 6,890 |
| Jackson County | 8 | 4.18% | 13,791 | 13,238 |
| Butler County | 9 | 4.17% | 70,198 | 67,389 |
| Douglas County | 10 | 4.06% | 123,609 | 118,787 |
| Dickinson County | 11 | 3.44% | 18,999 | 18,367 |
| Anderson County | 12 | 3.28% | 8,098 | 7,841 |
| Wyandotte County | 13 | 3.24% | 174,390 | 168,920 |
| Riley County | 14 | 3.21% | 74,325 | 72,011 |
| Comanche County | 15 | 3.09% | 1,734 | 1,682 |
| Lyon County | 16 | 2.84% | 33,026 | 32,113 |
| Doniphan County | 17 | 2.64% | 7,665 | 7,468 |
| Ottawa County | 18 | 2.51% | 5,875 | 5,731 |
| Hamilton County | 19 | 2.37% | 2,546 | 2,487 |
| Cheyenne County | 20 | 2.22% | 2,670 | 2,612 |
| Finney County | 21 | 1.97% | 39,064 | 38,310 |
| Kiowa County | 22 | 1.92% | 2,500 | 2,453 |
| Linn County | 23 | 1.69% | 9,753 | 9,591 |
| Washington County | 24 | 1.52% | 5,610 | 5,526 |
| Franklin County | 25 | 1.38% | 26,373 | 26,015 |
| McPherson County | 26 | 1.15% | 30,530 | 30,184 |
| Mitchell County | 27 | 0.92% | 5,831 | 5,778 |
| Atchison County | 28 | 0.85% | 16,463 | 16,325 |
| Ellis County | 29 | 0.79% | 29,181 | 28,951 |
| Pratt County | 30 | 0.63% | 9,197 | 9,139 |
| Bourbon County | 31 | 0.52% | 14,408 | 14,333 |
| Gray County | 32 | 0.35% | 5,660 | 5,640 |
| Jefferson County | 33 | 0.31% | 18,382 | 18,325 |
| Trego County | 34 | 0.07% | 2,806 | 2,804 |
| Coffey County | 35 | -0.04% | 8,359 | 8,362 |
| Shawnee County | 36 | -0.04% | 178,634 | 178,711 |
| Harper County | 37 | -0.22% | 5,455 | 5,467 |
| Ford County | 38 | -0.28% | 34,122 | 34,218 |
| Lincoln County | 39 | -0.34% | 2,936 | 2,946 |
| Sumner County | 40 | -0.45% | 22,222 | 22,323 |
| Crawford County | 41 | -0.45% | 38,774 | 38,951 |
| Cherokee County | 42 | -0.48% | 19,209 | 19,301 |
| Smith County | 43 | -0.51% | 3,541 | 3,559 |
| Logan County | 44 | -0.62% | 2,726 | 2,743 |
| Woodson County | 45 | -0.65% | 3,079 | 3,099 |
| Reno County | 46 | -0.78% | 61,413 | 61,894 |
| Osage County | 47 | -0.79% | 15,615 | 15,740 |
| Neosho County | 48 | -0.95% | 15,754 | 15,905 |
| Marshall County | 49 | -0.98% | 9,924 | 10,022 |
| Harvey County | 50 | -1% | 33,656 | 33,996 |
| Saline County | 51 | -1.02% | 53,693 | 54,248 |
| Republic County | 52 | -1.05% | 4,623 | 4,672 |
| Jewell County | 53 | -1.16% | 2,895 | 2,929 |
| Cowley County | 54 | -1.35% | 34,068 | 34,535 |
| Norton County | 55 | -1.38% | 5,377 | 5,452 |
| Rice County | 56 | -1.52% | 9,242 | 9,385 |
| Allen County | 57 | -1.55% | 12,343 | 12,537 |
| Graham County | 58 | -1.58% | 2,368 | 2,406 |
| Sherman County | 59 | -1.63% | 5,806 | 5,902 |
| Seward County | 60 | -2.05% | 21,410 | 21,857 |
| Morris County | 61 | -2.07% | 5,259 | 5,370 |
| Geary County | 62 | -2.1% | 35,993 | 36,766 |
| Decatur County | 63 | -2.29% | 2,684 | 2,747 |
| Chautauqua County | 64 | -2.46% | 3,297 | 3,380 |
| Nemaha County | 65 | -2.58% | 9,998 | 10,263 |
| Clay County | 66 | -2.61% | 7,915 | 8,127 |
| Marion County | 67 | -2.66% | 11,474 | 11,787 |
| Russell County | 68 | -2.68% | 6,494 | 6,673 |
| Barton County | 69 | -2.84% | 24,703 | 25,426 |
| Sheridan County | 70 | -2.87% | 2,373 | 2,443 |
| Greenwood County | 71 | -3.01% | 5,795 | 5,975 |
| Thomas County | 72 | -3.06% | 7,690 | 7,933 |
| Ellsworth County | 73 | -3.09% | 6,174 | 6,371 |
| Wilson County | 74 | -3.12% | 8,318 | 8,586 |
| Barber County | 75 | -3.55% | 4,054 | 4,203 |
| Kearny County | 76 | -3.59% | 3,818 | 3,960 |
| Labette County | 77 | -3.72% | 19,410 | 20,160 |
| Ness County | 78 | -3.96% | 2,573 | 2,679 |
| Rooks County | 79 | -3.97% | 4,692 | 4,886 |
| Clark County | 80 | -4.05% | 1,897 | 1,977 |
| Hodgeman County | 81 | -4.66% | 1,657 | 1,738 |
| Grant County | 82 | -4.79% | 6,975 | 7,326 |
| Elk County | 83 | -4.85% | 2,352 | 2,472 |
| Montgomery County | 84 | -4.89% | 29,865 | 31,400 |
| Meade County | 85 | -5.12% | 3,854 | 4,062 |
| Edwards County | 86 | -5.31% | 2,731 | 2,884 |
| Stevens County | 87 | -5.51% | 4,957 | 5,246 |
| Wichita County | 88 | -5.54% | 2,030 | 2,149 |
| Pawnee County | 89 | -5.57% | 5,900 | 6,248 |
| Phillips County | 90 | -5.73% | 4,675 | 4,959 |
| Stafford County | 91 | -6.05% | 3,807 | 4,052 |
| Cloud County | 92 | -6.07% | 8,471 | 9,018 |
| Rush County | 93 | -6.11% | 2,764 | 2,944 |
| Scott County | 94 | -6.14% | 4,818 | 5,133 |
| Brown County | 95 | -6.19% | 8,892 | 9,479 |
| Chase County | 96 | -6.37% | 2,411 | 2,575 |
| Wallace County | 97 | -6.48% | 1,414 | 1,512 |
| Haskell County | 98 | -6.57% | 3,513 | 3,760 |
| Gove County | 99 | -7.66% | 2,508 | 2,716 |
| Osborne County | 100 | -8.94% | 3,179 | 3,491 |
| Rawlins County | 101 | -9.25% | 2,336 | 2,574 |
| Kingman County | 102 | -10.3% | 6,656 | 7,420 |
| Lane County | 103 | -12.1% | 1,380 | 1,570 |
| Greeley County | 104 | -13.1% | 1,108 | 1,275 |
| Morton County | 105 | -15.98% | 2,271 | 2,703 |
Kansas's counties show varied growth patterns from 2020 to 2026. Pottawatomie County leads with 1.39% annualized growth, followed by Miami County (1.1%) and Johnson County (0.93%). The largest counties are Johnson County (645,940), Sedgwick County (547,735), and Shawnee County (178,634). Of the 105 counties in Kansas, 34 are growing while 71 have experienced population decline. Overall, counties averaged -0.28% annualized growth, with total population growing by 0.4% annually.
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