| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Adams County | 1 | 6.05% | 21,939 | 20,687 |
| Lafayette County | 2 | 5.96% | 17,609 | 16,619 |
| Dane County | 3 | 5.65% | 594,425 | 562,615 |
| Florence County | 4 | 5.45% | 4,814 | 4,565 |
| St. Croix County | 5 | 5.35% | 98,898 | 93,875 |
| Forest County | 6 | 5.03% | 9,634 | 9,173 |
| Sawyer County | 7 | 4.3% | 18,901 | 18,122 |
| Burnett County | 8 | 4.09% | 17,258 | 16,580 |
| Ozaukee County | 9 | 3.71% | 95,027 | 91,631 |
| Pierce County | 10 | 3.58% | 43,732 | 42,221 |
| Waushara County | 11 | 3.43% | 25,373 | 24,532 |
| Bayfield County | 12 | 3.38% | 16,789 | 16,240 |
| Eau Claire County | 13 | 3.36% | 109,455 | 105,898 |
| Oconto County | 14 | 3.34% | 40,384 | 39,077 |
| Calumet County | 15 | 3.29% | 54,200 | 52,475 |
| Washburn County | 16 | 3.2% | 17,150 | 16,618 |
| Outagamie County | 17 | 3.17% | 197,003 | 190,959 |
| Brown County | 18 | 3.12% | 277,355 | 268,952 |
| Vilas County | 19 | 2.93% | 23,769 | 23,093 |
| Waukesha County | 20 | 2.74% | 418,654 | 407,506 |
| Marquette County | 21 | 2.71% | 16,016 | 15,594 |
| Vernon County | 22 | 2.69% | 31,521 | 30,695 |
| Portage County | 23 | 2.42% | 72,128 | 70,423 |
| Chippewa County | 24 | 2.41% | 67,934 | 66,334 |
| Dunn County | 25 | 2.15% | 46,440 | 45,462 |
| Rock County | 26 | 2.15% | 167,279 | 163,763 |
| Washington County | 27 | 2.14% | 139,732 | 136,806 |
| Shawano County | 28 | 2.09% | 41,714 | 40,859 |
| Marinette County | 29 | 2.08% | 42,758 | 41,887 |
| Winnebago County | 30 | 1.93% | 175,142 | 171,833 |
| Trempealeau County | 31 | 1.91% | 31,414 | 30,825 |
| Pepin County | 32 | 1.85% | 7,485 | 7,349 |
| Polk County | 33 | 1.79% | 45,834 | 45,028 |
| Door County | 34 | 1.74% | 30,651 | 30,128 |
| Sauk County | 35 | 1.45% | 66,751 | 65,796 |
| Clark County | 36 | 1.41% | 35,129 | 34,640 |
| Green Lake County | 37 | 1.38% | 19,278 | 19,016 |
| Marathon County | 38 | 1.2% | 139,770 | 138,119 |
| Ashland County | 39 | 1.1% | 16,205 | 16,028 |
| Taylor County | 40 | 0.99% | 20,139 | 19,942 |
| Grant County | 41 | 0.96% | 52,488 | 51,989 |
| Kewaunee County | 42 | 0.95% | 20,747 | 20,552 |
| Iowa County | 43 | 0.89% | 23,927 | 23,716 |
| Walworth County | 44 | 0.77% | 106,131 | 105,324 |
| Monroe County | 45 | 0.72% | 46,639 | 46,307 |
| Racine County | 46 | 0.67% | 199,397 | 198,061 |
| La Crosse County | 47 | 0.63% | 121,715 | 120,955 |
| Oneida County | 48 | 0.59% | 38,087 | 37,864 |
| Langlade County | 49 | 0.52% | 19,566 | 19,465 |
| Green County | 50 | 0.48% | 37,217 | 37,039 |
| Fond du Lac County | 51 | 0.44% | 104,617 | 104,159 |
| Jefferson County | 52 | 0.29% | 86,470 | 86,219 |
| Manitowoc County | 53 | 0.17% | 81,537 | 81,401 |
| Rusk County | 54 | -0.02% | 14,166 | 14,169 |
| Dodge County | 55 | -0.03% | 89,317 | 89,343 |
| Sheboygan County | 56 | -0.03% | 118,003 | 118,040 |
| Lincoln County | 57 | -0.04% | 28,411 | 28,423 |
| Wood County | 58 | -0.42% | 73,865 | 74,180 |
| Kenosha County | 59 | -0.44% | 168,448 | 169,186 |
| Columbia County | 60 | -0.47% | 58,259 | 58,534 |
| Juneau County | 61 | -0.47% | 26,652 | 26,779 |
| Waupaca County | 62 | -0.59% | 51,493 | 51,799 |
| Jackson County | 63 | -0.62% | 20,965 | 21,096 |
| Douglas County | 64 | -0.65% | 44,062 | 44,351 |
| Buffalo County | 65 | -0.71% | 13,238 | 13,333 |
| Barron County | 66 | -0.99% | 46,257 | 46,719 |
| Crawford County | 67 | -1.13% | 15,901 | 16,082 |
| Price County | 68 | -1.2% | 13,864 | 14,032 |
| Iron County | 69 | -1.4% | 6,058 | 6,144 |
| Milwaukee County | 70 | -1.54% | 924,109 | 938,606 |
| Richland County | 71 | -1.96% | 16,943 | 17,281 |
| Menominee County | 72 | -2.11% | 4,168 | 4,258 |
Wisconsin's counties show varied growth patterns from 2020 to 2026. Adams County leads with 0.98% annualized growth, followed by Lafayette County (0.97%) and Dane County (0.92%). The largest counties are Milwaukee County (924,109), Dane County (594,425), and Waukesha County (418,654). Of the 72 counties in Wisconsin, 53 are growing while 19 have experienced population decline. Overall, counties averaged 0.25% annualized growth, with total population growing by 0.26% annually.
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