County List
| County | County Seat | Created | Origin | Admin |
|---|---|---|---|---|
| Adams County | Friendship | 1848 | Portage | |
| Ashland County | Ashland | 1860 | Unorganized | |
| Barron County | Barron | 1874 | Dalles and Polk | |
| Bayfield County | Washburn | 1866 | Ashland | |
| Brown County | Green Bay | 1818 | Unorganized | |
| Buffalo County | Alma | 1853 | Trempealeau | |
| Burnett County | Siren | 1856 | Polk | |
| Calumet County | Chilton | 1836 | Unorganized | |
| Chippewa County | Chippewa Falls | 1845 | Crawford | |
| Clark County | Neillsville | 1853 | Crawford | |
| Columbia County | Portage | 1846 | Portage | |
| Crawford County | Prairie du Chien | 1818 | Unorganized | |
| Dane County | Madison | 1836 | Unorganized | |
| Dodge County | Juneau | 1836 | Unorganized | |
| Door County | Sturgeon Bay | 1851 | Brown | |
| Douglas County | Superior | 1854 | Unorganized | |
| Dunn County | Menomonie | 1854 | Chippewa | |
| Eau Claire County | Eau Claire | 1856 | Chippewa | |
| Florence County | Florence | 1882 | Marinette and Oconto | |
| Fond du Lac County | Fond du Lac | 1836 | Unorganized | |
| Forest County | Crandon | 1885 | Langlade and Oconto | |
| Grant County | Lancaster | 1836 | Unorganized | |
| Green County | Monroe | 1836 | Unorganized | |
| Green Lake County | Green Lake | 1858 | Marquette | |
| Iowa County | Dodgeville | 1829 | Unorganized | |
| Iron County | Hurley | 1893 | Ashland and Oneida | |
| Jackson County | Black River Falls | 1853 | LaCrosse | |
| Jefferson County | Jefferson | 1836 | Milwaukee | |
| Juneau County | Mauston | 1856 | Adams | |
| Kenosha County | Kenosha | 1850 | Racine | |
| Kewaunee County | Kewaunee | 1852 | Manitowoc | |
| LaCrosse County | LaCrosse | 1851 | Unorganized | |
| Lafayette County | Darlington | 1846 | Iowa | |
| Langlade County | Antigo | 1881 | New | |
| Lincoln County | Merrill | 1874 | Marathon | |
| Manitowoc County | Manitowoc | 1836 | Unorganized | |
| Marathon County | Wausau | 1850 | Portage | |
| Marinette County | Marinette | 1879 | Oconto | |
| Marquette County | Montello | 1836 | Marquette District | |
| Menominee County | Keshena | 1961 | Menominee Indian Reservation | |
| Milwaukee County | Milwaukee | 1835 | Unorganized | |
| Monroe County | Sparta | 1854 | LaCrosse | |
| Oconto County | Oconto | 1851 | Unorganized | |
| Oneida County | Rhinelander | 1885 | Lincoln | |
| Outagamie County | Appleton | 1851 | Brown | |
| Ozaukee County | Port Washington | 1853 | Milwaukee | |
| Pepin County | Durand | 1858 | Dunn | |
| Pierce County | Ellsworth | 1853 | St Croix | |
| Polk County | Balsam Lake | 1853 | St Croix | |
| Portage County | Stevens Point | 1836 | Unorganized | |
| Price County | Phillips | 1879 | Chippewa and Lincoln | |
| Racine County | Racine | 1836 | Unorganized | |
| Richland County | Richland Center | 1842 | Iowa | |
| Rock County | Janesville | 1836 | Unorganized | |
| Rusk County | Ladysmith | 1905 | Gates | |
| St Croix County | Hudson | 1840 | Unorganized | |
| Sauk County | Baraboo | 1840 | Unorganized | |
| Sawyer County | Hayward | 1883 | Oconto | |
| Shawano County | Shawano | 1853 | Oconto | |
| Sheboygan County | Sheboygan | 1836 | Unorganized | |
| Taylor County | Medford | 1875 | Clark, Lincoln, Marathon and Chippewa | |
| Trempealeau County | Whitehall | 1854 | Crawford and LaCrosse | |
| Vernon County | Viroqua | 1862 | Bad Axe | |
| Vilas County | Eagle River | 1893 | Oneida | |
| Walworth County | Elkhorn | 1836 | Unorganized | |
| Washburn County | Shell Lake | 1883 | Burnett | |
| Washington County | West Bend | 1836 | Unorganized | |
| Waukesha County | Waukesha | 1846 | Milwaukee | |
| Waupaca County | Waupace | 1851 | Brown and Winnebago | |
| Waushara County | Wautoma | 1851 | Marquette | |
| Winnebago County | Oshkosh | 1840 | Unorganized | |
| Wood County | Wisconsin Rapids | 1856 | Portage |