| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Pottawatomie County | 1 | 8.23% | 27,514 | 25,422 |
| Miami County | 2 | 7.17% | 36,679 | 34,224 |
| Johnson County | 3 | 5.21% | 642,980 | 611,129 |
| Linn County | 4 | 4.6% | 10,036 | 9,595 |
| Butler County | 5 | 3.64% | 69,842 | 67,388 |
| Leavenworth County | 6 | 3.49% | 84,836 | 81,974 |
| Sedgwick County | 7 | 3.36% | 542,480 | 524,831 |
| Anderson County | 8 | 3.34% | 8,103 | 7,841 |
| Coffey County | 9 | 2.96% | 8,605 | 8,358 |
| Douglas County | 10 | 1.78% | 120,901 | 118,781 |
| Doniphan County | 11 | 1.65% | 7,594 | 7,471 |
| Jackson County | 12 | 1.62% | 13,452 | 13,237 |
| Riley County | 13 | 1.55% | 73,124 | 72,011 |
| Wyandotte County | 14 | 1.42% | 171,324 | 168,921 |
| Dickinson County | 15 | 1.38% | 18,636 | 18,383 |
| Franklin County | 16 | 1.3% | 26,353 | 26,014 |
| Geary County | 17 | 1.2% | 37,211 | 36,768 |
| Wabaunsee County | 18 | 0.9% | 6,957 | 6,895 |
| Woodson County | 19 | 0.81% | 3,120 | 3,095 |
| Stafford County | 20 | 0.76% | 4,091 | 4,060 |
| Ellis County | 21 | 0.6% | 29,124 | 28,951 |
| Morris County | 22 | 0.48% | 5,389 | 5,363 |
| Crawford County | 23 | 0.26% | 39,056 | 38,955 |
| Lyon County | 24 | 0.22% | 32,181 | 32,110 |
| Shawnee County | 25 | 0.16% | 178,992 | 178,699 |
| Hamilton County | 26 | 0.08% | 2,491 | 2,489 |
| Cowley County | 27 | -0.04% | 34,513 | 34,528 |
| Pratt County | 28 | -0.13% | 9,128 | 9,140 |
| Jefferson County | 29 | -0.25% | 18,285 | 18,330 |
| Reno County | 30 | -0.3% | 61,708 | 61,891 |
| Comanche County | 31 | -0.36% | 1,673 | 1,679 |
| Kiowa County | 32 | -0.37% | 2,448 | 2,457 |
| Sumner County | 33 | -0.4% | 22,252 | 22,341 |
| Republic County | 34 | -0.47% | 4,655 | 4,677 |
| Gray County | 35 | -0.53% | 5,614 | 5,644 |
| McPherson County | 36 | -0.54% | 30,033 | 30,195 |
| Elk County | 37 | -0.56% | 2,466 | 2,480 |
| Graham County | 38 | -0.62% | 2,391 | 2,406 |
| Smith County | 39 | -0.67% | 3,542 | 3,566 |
| Osage County | 40 | -0.68% | 15,640 | 15,747 |
| Washington County | 41 | -0.7% | 5,505 | 5,544 |
| Cloud County | 42 | -0.82% | 8,936 | 9,010 |
| Ottawa County | 43 | -0.86% | 5,680 | 5,729 |
| Cheyenne County | 44 | -0.88% | 2,590 | 2,613 |
| Chase County | 45 | -0.89% | 2,551 | 2,574 |
| Atchison County | 46 | -0.92% | 16,175 | 16,325 |
| Bourbon County | 47 | -0.98% | 14,198 | 14,339 |
| Sheridan County | 48 | -1.02% | 2,421 | 2,446 |
| Harvey County | 49 | -1.34% | 33,540 | 33,996 |
| Cherokee County | 50 | -1.35% | 19,043 | 19,303 |
| Rice County | 51 | -1.35% | 9,255 | 9,382 |
| Ford County | 52 | -1.5% | 33,699 | 34,213 |
| Saline County | 53 | -1.51% | 53,440 | 54,260 |
| Kearny County | 54 | -1.54% | 3,907 | 3,968 |
| Decatur County | 55 | -1.56% | 2,719 | 2,762 |
| Marion County | 56 | -1.69% | 11,589 | 11,788 |
| Neosho County | 57 | -1.72% | 15,643 | 15,916 |
| Clay County | 58 | -1.97% | 7,966 | 8,126 |
| Marshall County | 59 | -2.26% | 9,794 | 10,020 |
| Allen County | 60 | -2.31% | 12,243 | 12,533 |
| Trego County | 61 | -2.31% | 2,744 | 2,809 |
| Nemaha County | 62 | -2.4% | 10,022 | 10,268 |
| Ellsworth County | 63 | -2.43% | 6,212 | 6,367 |
| Labette County | 64 | -2.44% | 19,676 | 20,169 |
| Harper County | 65 | -2.52% | 5,333 | 5,471 |
| Russell County | 66 | -2.53% | 6,508 | 6,677 |
| Ness County | 67 | -2.58% | 2,605 | 2,674 |
| Greenwood County | 68 | -2.6% | 5,806 | 5,961 |
| Rush County | 69 | -2.76% | 2,859 | 2,940 |
| Finney County | 70 | -2.85% | 37,216 | 38,307 |
| Thomas County | 71 | -2.88% | 7,698 | 7,926 |
| Barber County | 72 | -2.93% | 4,081 | 4,204 |
| Sherman County | 73 | -2.93% | 5,734 | 5,907 |
| Barton County | 74 | -3.03% | 24,667 | 25,437 |
| Haskell County | 75 | -3.14% | 3,640 | 3,758 |
| Wilson County | 76 | -3.31% | 8,297 | 8,581 |
| Norton County | 77 | -3.32% | 5,271 | 5,452 |
| Clark County | 78 | -3.34% | 1,910 | 1,976 |
| Lane County | 79 | -3.38% | 1,515 | 1,568 |
| Chautauqua County | 80 | -3.43% | 3,269 | 3,385 |
| Seward County | 81 | -3.88% | 21,009 | 21,857 |
| Logan County | 82 | -3.9% | 2,635 | 2,742 |
| Lincoln County | 83 | -4.27% | 2,824 | 2,950 |
| Brown County | 84 | -4.27% | 9,075 | 9,480 |
| Gove County | 85 | -4.39% | 2,593 | 2,712 |
| Jewell County | 86 | -4.51% | 2,796 | 2,928 |
| Grant County | 87 | -4.55% | 6,992 | 7,325 |
| Montgomery County | 88 | -4.63% | 29,948 | 31,401 |
| Rawlins County | 89 | -5.06% | 2,437 | 2,567 |
| Pawnee County | 90 | -5.12% | 5,931 | 6,251 |
| Kingman County | 91 | -5.3% | 7,033 | 7,427 |
| Phillips County | 92 | -5.31% | 4,705 | 4,969 |
| Stanton County | 93 | -5.58% | 1,963 | 2,079 |
| Mitchell County | 94 | -5.82% | 5,440 | 5,776 |
| Wichita County | 95 | -5.91% | 2,023 | 2,150 |
| Meade County | 96 | -6.09% | 3,812 | 4,059 |
| Stevens County | 97 | -6.12% | 4,921 | 5,242 |
| Rooks County | 98 | -6.37% | 4,575 | 4,886 |
| Wallace County | 99 | -7.28% | 1,402 | 1,512 |
| Osborne County | 100 | -7.4% | 3,229 | 3,487 |
| Greeley County | 101 | -8.07% | 1,173 | 1,276 |
| Scott County | 102 | -8.15% | 4,722 | 5,141 |
| Morton County | 103 | -9.45% | 2,442 | 2,697 |
| Hodgeman County | 104 | -9.65% | 1,573 | 1,741 |
| Edwards County | 105 | -11.42% | 2,559 | 2,889 |
Kansas's counties show varied growth patterns from 2020 to 2026. Pottawatomie County leads with 1.33% annualized growth, followed by Miami County (1.16%) and Johnson County (0.85%). The largest counties are Johnson County (642,980), Sedgwick County (542,480), and Shawnee County (178,992). Of the 105 counties in Kansas, 26 are growing while 79 have experienced population decline. Overall, counties averaged -0.3% annualized growth, with total population growing by 0.29% annually.
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