| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Dane County | 1 | 7.63% | 605,563 | 562,620 |
| Lafayette County | 2 | 7.2% | 17,800 | 16,604 |
| Forest County | 3 | 6.41% | 9,756 | 9,168 |
| Sawyer County | 4 | 6.34% | 19,267 | 18,119 |
| St. Croix County | 5 | 6.02% | 99,550 | 93,893 |
| Pepin County | 6 | 4.88% | 7,701 | 7,343 |
| Burnett County | 7 | 4.86% | 17,383 | 16,578 |
| Eau Claire County | 8 | 4.25% | 110,374 | 105,877 |
| Bayfield County | 9 | 4.05% | 16,896 | 16,238 |
| Pierce County | 10 | 4.05% | 43,938 | 42,229 |
| Vilas County | 11 | 3.98% | 24,016 | 23,097 |
| Oconto County | 12 | 3.97% | 40,629 | 39,077 |
| Portage County | 13 | 3.96% | 73,198 | 70,412 |
| Outagamie County | 14 | 3.95% | 198,514 | 190,973 |
| Waukesha County | 15 | 3.81% | 423,061 | 407,518 |
| Menominee County | 16 | 3.71% | 4,416 | 4,258 |
| Ozaukee County | 17 | 3.49% | 94,828 | 91,627 |
| Vernon County | 18 | 3.44% | 31,767 | 30,710 |
| Calumet County | 19 | 3.28% | 54,200 | 52,478 |
| Brown County | 20 | 3.2% | 277,579 | 268,966 |
| Dunn County | 21 | 2.86% | 46,751 | 45,453 |
| Waushara County | 22 | 2.68% | 25,209 | 24,550 |
| Chippewa County | 23 | 2.6% | 68,071 | 66,346 |
| Grant County | 24 | 2.35% | 53,202 | 51,979 |
| Ashland County | 25 | 2.29% | 16,382 | 16,015 |
| Rock County | 26 | 2.28% | 167,497 | 163,761 |
| Winnebago County | 27 | 2.28% | 175,711 | 171,796 |
| Marinette County | 28 | 2.16% | 42,803 | 41,900 |
| Sauk County | 29 | 2.1% | 67,172 | 65,793 |
| Washburn County | 30 | 1.99% | 16,954 | 16,623 |
| Shawano County | 31 | 1.79% | 41,601 | 40,869 |
| Green County | 32 | 1.75% | 37,681 | 37,033 |
| Washington County | 33 | 1.74% | 139,189 | 136,811 |
| Iowa County | 34 | 1.72% | 24,127 | 23,718 |
| Polk County | 35 | 1.72% | 45,803 | 45,029 |
| Taylor County | 36 | 1.59% | 20,255 | 19,938 |
| Racine County | 37 | 1.55% | 201,139 | 198,065 |
| Adams County | 38 | 1.54% | 21,000 | 20,682 |
| Florence County | 39 | 1.45% | 4,629 | 4,563 |
| Buffalo County | 40 | 1.42% | 13,512 | 13,323 |
| Langlade County | 41 | 1.38% | 19,735 | 19,466 |
| Green Lake County | 42 | 1.31% | 19,276 | 19,027 |
| Kewaunee County | 43 | 1.09% | 20,787 | 20,563 |
| Marathon County | 44 | 1.07% | 139,597 | 138,114 |
| Door County | 45 | 0.95% | 30,404 | 30,119 |
| Monroe County | 46 | 0.92% | 46,724 | 46,299 |
| Sheboygan County | 47 | 0.8% | 119,003 | 118,058 |
| Kenosha County | 48 | 0.78% | 170,528 | 169,202 |
| Walworth County | 49 | 0.72% | 106,071 | 105,310 |
| Oneida County | 50 | 0.71% | 38,147 | 37,877 |
| Jefferson County | 51 | 0.68% | 86,793 | 86,208 |
| La Crosse County | 52 | 0.66% | 121,746 | 120,943 |
| Manitowoc County | 53 | 0.59% | 81,889 | 81,412 |
| Clark County | 54 | 0.55% | 34,819 | 34,629 |
| Jackson County | 55 | 0.52% | 21,205 | 21,095 |
| Fond du Lac County | 56 | 0.37% | 104,537 | 104,156 |
| Lincoln County | 57 | 0.33% | 28,523 | 28,429 |
| Price County | 58 | 0.21% | 14,065 | 14,036 |
| Iron County | 59 | 0.18% | 6,151 | 6,140 |
| Douglas County | 60 | -0.05% | 44,324 | 44,348 |
| Columbia County | 61 | -0.13% | 58,441 | 58,520 |
| Crawford County | 62 | -0.26% | 16,042 | 16,084 |
| Barron County | 63 | -0.29% | 46,586 | 46,723 |
| Marquette County | 64 | -0.34% | 15,527 | 15,580 |
| Juneau County | 65 | -0.46% | 26,656 | 26,780 |
| Dodge County | 66 | -0.49% | 88,903 | 89,344 |
| Wood County | 67 | -0.58% | 73,755 | 74,189 |
| Milwaukee County | 68 | -0.86% | 930,500 | 938,609 |
| Trempealeau County | 69 | -0.93% | 30,525 | 30,813 |
| Rusk County | 70 | -1.28% | 14,000 | 14,181 |
| Waupaca County | 71 | -1.82% | 50,865 | 51,806 |
| Richland County | 72 | -2.41% | 16,867 | 17,283 |
Wisconsin's counties show varied growth patterns from 2020 to 2026. Dane County leads with 1.23% annualized growth, followed by Lafayette County (1.17%) and Forest County (1.04%). The largest counties are Milwaukee County (930,500), Dane County (605,563), and Waukesha County (423,061). Of the 72 counties in Wisconsin, 59 are growing while 13 have experienced population decline. Overall, counties averaged 0.31% annualized growth, with total population growing by 0.35% annually.
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