| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Adams County | 1 | 5.64% | 21,843 | 20,677 |
| Dane County | 2 | 4.96% | 590,525 | 562,615 |
| St. Croix County | 3 | 4.78% | 98,355 | 93,872 |
| Vilas County | 4 | 4.65% | 24,171 | 23,097 |
| Bayfield County | 5 | 4.63% | 16,989 | 16,237 |
| Burnett County | 6 | 4.36% | 17,300 | 16,577 |
| Pierce County | 7 | 4.13% | 43,974 | 42,229 |
| Eau Claire County | 8 | 4% | 110,137 | 105,897 |
| Calumet County | 9 | 3.22% | 54,173 | 52,485 |
| Green Lake County | 10 | 3.15% | 19,616 | 19,017 |
| Pepin County | 11 | 3.08% | 7,567 | 7,341 |
| Ozaukee County | 12 | 2.96% | 94,338 | 91,629 |
| Sawyer County | 13 | 2.74% | 18,614 | 18,118 |
| Washburn County | 14 | 2.6% | 17,048 | 16,616 |
| Polk County | 15 | 2.56% | 46,194 | 45,039 |
| Lafayette County | 16 | 2.44% | 17,023 | 16,618 |
| Iron County | 17 | 2.39% | 6,286 | 6,139 |
| Waukesha County | 18 | 2.39% | 417,227 | 407,496 |
| Marquette County | 19 | 2.37% | 15,960 | 15,590 |
| Vernon County | 20 | 2.24% | 31,384 | 30,696 |
| Outagamie County | 21 | 2.2% | 195,164 | 190,966 |
| Oconto County | 22 | 2.19% | 39,933 | 39,077 |
| Portage County | 23 | 1.99% | 71,804 | 70,405 |
| Brown County | 24 | 1.92% | 274,115 | 268,951 |
| Taylor County | 25 | 1.81% | 20,292 | 19,932 |
| Waushara County | 26 | 1.62% | 24,948 | 24,550 |
| Chippewa County | 27 | 1.6% | 67,404 | 66,341 |
| Washington County | 28 | 1.6% | 138,992 | 136,801 |
| Door County | 29 | 1.55% | 30,584 | 30,117 |
| Forest County | 30 | 1.55% | 9,311 | 9,169 |
| Dunn County | 31 | 1.54% | 46,138 | 45,440 |
| Florence County | 32 | 1.51% | 4,634 | 4,565 |
| Marathon County | 33 | 1.34% | 139,926 | 138,078 |
| Buffalo County | 34 | 1.26% | 13,477 | 13,309 |
| Shawano County | 35 | 1.22% | 41,353 | 40,855 |
| Marinette County | 36 | 1.19% | 42,386 | 41,889 |
| Winnebago County | 37 | 1.17% | 173,829 | 171,815 |
| Oneida County | 38 | 1.12% | 38,292 | 37,869 |
| Iowa County | 39 | 0.98% | 23,952 | 23,719 |
| Kewaunee County | 40 | 0.98% | 20,764 | 20,563 |
| Rock County | 41 | 0.85% | 165,152 | 163,758 |
| Ashland County | 42 | 0.84% | 16,157 | 16,022 |
| Monroe County | 43 | 0.79% | 46,665 | 46,300 |
| Walworth County | 44 | 0.77% | 106,138 | 105,323 |
| Barron County | 45 | 0.71% | 47,069 | 46,737 |
| Sauk County | 46 | 0.66% | 66,220 | 65,784 |
| Clark County | 47 | 0.54% | 34,858 | 34,672 |
| Rusk County | 48 | 0.4% | 14,231 | 14,175 |
| Trempealeau County | 49 | 0.31% | 30,915 | 30,818 |
| Richland County | 50 | 0.3% | 17,335 | 17,283 |
| Lincoln County | 51 | 0.28% | 28,505 | 28,426 |
| Manitowoc County | 52 | 0.26% | 81,597 | 81,387 |
| Menominee County | 53 | 0.21% | 4,266 | 4,257 |
| Racine County | 54 | 0.18% | 197,917 | 197,568 |
| Green County | 55 | 0.13% | 37,083 | 37,035 |
| Wood County | 56 | 0.08% | 74,261 | 74,199 |
| Fond du Lac County | 57 | 0.05% | 104,220 | 104,169 |
| La Crosse County | 58 | 0.03% | 120,954 | 120,921 |
| Douglas County | 59 | -0.02% | 44,340 | 44,351 |
| Sheboygan County | 60 | -0.1% | 117,934 | 118,053 |
| Price County | 61 | -0.26% | 13,988 | 14,025 |
| Jefferson County | 62 | -0.5% | 85,779 | 86,208 |
| Grant County | 63 | -0.75% | 51,597 | 51,985 |
| Kenosha County | 64 | -1.19% | 167,190 | 169,195 |
| Columbia County | 65 | -1.22% | 57,817 | 58,533 |
| Waupaca County | 66 | -1.26% | 51,144 | 51,798 |
| Langlade County | 67 | -1.31% | 19,208 | 19,463 |
| Jackson County | 68 | -1.5% | 20,779 | 21,096 |
| Dodge County | 69 | -1.58% | 87,945 | 89,353 |
| Crawford County | 70 | -1.76% | 15,802 | 16,085 |
| Juneau County | 71 | -2.03% | 26,232 | 26,775 |
| Milwaukee County | 72 | -2.78% | 912,459 | 938,550 |
Wisconsin's counties show varied growth patterns from 2020 to 2025. Adams County leads with 5.64% annualized growth, followed by Dane County (4.96%) and St. Croix County (4.78%). The largest counties are Milwaukee County (912,459), Dane County (590,525), and Waukesha County (417,227). Of the 72 counties in Wisconsin, 58 are growing while 14 have experienced population decline. Overall, counties averaged 1.26% annualized growth, with total population growing by 0.93% annually.