| COUNTY NAME | COUNTY SEAT | DATE FORMED | ORIGINAL COUNTY | BIRTH REGISTRATION BEGAN | MARRIAGE REGISTRATION BEGAN | DEATH REGISTRATION BEGAN |
| Adams | Friendship | Mar 11, 1848 | Portage | 1857 | 1857 | 1876 |
| Ashland | Ashland | March 27, 1860 | Bayfield (was LaPointe) | 1876 | 1874 | 1877 |
| Barron
( was Dallas County until 1869) |
Barron | March 19, 1859 | Chippewa and Polk | 1877 | 1868 | 1877 |
| Bayfield
(was LaPointe until 1866) |
Washburn | Feb 19, 1845 | St. Croix | 1879 | 1869 | 1870 |
| Brown | Green Bay | October 26, 1818 | Michigan Territory | 1814 | 1823 | 1834 |
| Buffalo | Alma | July 8, 1853 | Jackson | 1855 | 1856 | 1873 |
| Burnett | Siren | Mar 1, 1856 | Douglas and Polk | 1853 | 1869 | 1846 |
| Calumet | Chilton | Dec. 6, 1836 | Brown | 1858 | 1850 | 1856 |
| Chippewa | Chippewa Falls | Feb 3, 1845 | Crawford | 1858 | 1869 | 1855 |
| Clark | Neillsville | July 6, 1853 | Jackson | 1869 | 1857 | 1877 |
| Columbia | Portage | Feb 3, 1846 | Portage | 1860 | 1849 | 1877 |
| Crawford | Prairie du Chien | Oct 26, 1818 |
Michigan Territory |
1858 | 1862 | 1876 |
| Dane | Madison
(also the State Capitol) |
Dec 7, 1836 | Milwaukee Crawford and Iowa | 1860 | 1839 | 1876 |
| Dodge | Juneau | Dec 7, 1836 | Brown | 1870 | 1843 | 1852 |
| Door | Sturgeon Bay | Feb 11, 1851 | Brown | 1852 | 1860 | 1856 |
| Douglas | Superior | Feb 9, 1854 | Bayfield (was LaPointe then) | 1861 | 1854 | 1877 |
| Dunn | Menomonie | Feb 3, 1854 |
Chippewa |
1870 | 1858 | 1877 |
| Eau Claire | Eau Claire | Oct 6, 1856 | Chippewa | 1870 | 1857 | 1876 |
| Florence | Florence | March 18, 1882 | Oconto and Marinette | 1882 | 1882 | 1882 |
| Fond du Lac | Fond du Lac | Dec 7, 1836 | Brown | 1879 | 1844 | 1854 |
| Forest | Crandon | April 11, 1885 |
Oconto and Langlade |
1891 | 1889 | 1871 |
| Grant | Lancaster | Dec 8, 1836 | Iowa | 1870 | 1842 | 1876 |
| Green | Monroe | Dec 8, 1836 | Iowa | 1862 | 1838 | 1874 |
| Green Lake | Green Lake | Mar 5, 1858 | Marquette | 1864 | 1858 | 1877 |
| Iowa | Dodgeville | Oct 9, 1829 | Crawford | 1876 | 1836 | 1871 |
| Iron | Hurley | Mar 3, 1893 | Ashland | 1886 | 1893 | 1887 |
| Jackson | Black River Falls | Feb 11, 1853 | La Crosse | 1876 | 1858 | 1876 |
| Jefferson | Jefferson | Dec 7, 1836 | Miwaukee | 1852 | 1844 | 1856 |
| Juneau | Mauston | Oct 13, 1856 | Adams | 1877 | 1844 | 1876 |
| Kenosha | Kenosha | Jan 30, 1850 | Racine | 1876 | 1850 | 1876 |
| Kewaunee | Kewaunee | April 16, 1852 | Door | 1861 | 1857 | 1873 |
| LaCrosse | LaCrosse | Mar 1, 1851 | Crawford | 1877 | 1851 | 1876 |
| Lafayette | Darlington | Jan 31, 1846 | Iowa | 1854 | 1847 | 1877 |
| Langlade
(was New Langlade until 1881) |
Antigo | Feb 27. 1879 | Oconto | 1882 | 1881 | 1868 |
| Lincoln | Merrill | Mar 4, 1874 | Marathon | 1875 | 1875 | 1871 |
| Manitowoc | Manitowoc | Dec 7, 1836 | Brown | 1858 | 1859 | 1864 |
| Marathon | Wausaw | Feb 9, 1850 | Portage | 1870 | 1965 | 1968 |
| Marinette | Marinette | Feb 27, 1879 | Oconto | 1874 | 1878 | 1879 |
| Marquette | Montello | Dec 7, 1836 | Brown | 1864 | 1863 | 1876 |
| Menominee | Keshena | May 1, 1961 | Oconto, Shawano | 1961 | 1961 | 1961 |
| Milwaukee | Milwaukee | Sept 6, 1834 | Brown | 1835 | 1851 | 1872 |
| Monroe | Sparta | Mar 24, 1854 | LaCrosse | 1877 | 1856 | 1876 |
| Oconto | Oconto | Feb 6, 1851 | Brown | 1876 | 1855 | 1872 |
| Oneida | Rhinelander | Apr 11, 1885 | Lincoln | 1887 | 1877 | 1888 |
| Outagamie | Appleton | Feb 17, 1851 | Winnebago and Brown | 1856 | 1855 | 1869 |
| Ozaukee | Prot Washington | Mar 7, 1853 | Washington | 1852 | 1855 | 1849 |
| Pepin | Duramd | Feb 25, 1858 | Dunn | 1863 | 1857 | 1877 |
| Pierce | Ellsworth | Mar 14, 1853 | St. Croix | 1870 | 1851 | 1876 |
| Polk | Balsam Lake | Mar 14, 1853 | St Croix | 1867 | 1855 | 1865 |
| Portage
(Present day Columbia County was the original Portage County) |
Stevens Point | Dec 7, 1836 | Crawford and Brown | 1866 | 1859 | 1876 |
| Price | Phillips | Feb 26, 1879 | Lincoln and Chippewa | 1880 | 1880 | 1879 |
| Racine | Racine | Dec 7, 1836 | Milwaukee | 1877 | 1839 | 1880 |
| Richland | Richland Center | Feb 18, 1842 | Sauk, Crawford | 1875 | 1864 | 1876 |
| Rock | Janesville | Dec 7, 1836 | Milwaukee | 1856 | 1847 | 1871 |
| Rusk
(was Gates until 1905) |
Ladysmith | May 15, 1901 | Chippewa | 1900 | 1901 | 1901 |
| St. Croix | Hudson | Aug 1, 1840 | Crawford | 1858 | 1852 | 1876 |
| Sauk | Baraboo | Jan 11, 1840 | Portage, Crawford , Dane | 1864 | 1852 | 1876 |
| Sawyer | Hayward | Mar 10, 1883 | Ashland | 1869 | 1883 | 1883 |
| Shawano | Shawano | Feb 16,1853 | Waupaca, Oconto, Winnebago | 1862 | 1848 | 1873 |
| Sheboygan | Sheboygan | Dec 7, 1836 | Brown | 1852 | 1852 | 1854 |
| Taylor | Medford | Mar 9, 1875 | Chippewa, Lincoln, Clark, Marathon | 1877 | 1875 | 1877 |
| Trempealeau | Whitehall | Jan 27, 1854 | LaCrosse, Chippewa, Buffalo, Jackson | 1845 | 1856 | 1847 |
| Vernon
(was Bad Axe until 1862) |
Viroqua | Mar 1 1851 | Crawford | 1863 | 1855 | 1878 |
| Vilas | Eagle River | Apr 12, 1893 | Oneida | 1889 | 1893 | 1889 |
| Walworth | Elkhorn | Dec 7, 1836 | Milwaukee | 1872 | 1836 | 1872 |
| Washburn | Shell Lake | Mar 27, 1883 | Burnette | 1883 | 1883 | 1883 |
| Washington | West Bend | Dec 7, 1836 | Brown, Milwaukee | 1859 | 1846 | 1873 |
| Waukesha | Waukesha | Jan 31, 1846 | Milwaukee | 1860 | 1846 | 1872 |
| Waupaca | Waupaca | Feb 17, 1851 | Brown,
Winnebago |
1858 | 1852 | 1848 |
| Waushara | Wautoma | Feb 15, 1851 | Marquette | 1859 | 1852 | 1876 |
| Winnebago | Oshkosh | Jan 6, 1840 | Brown, Calumet, Fond du Lac, Marquette | 1876 | 1860 | 1876 |
| Wood | Wisconsin Rapids | Mar 7, 1856 | Portage | 1871 | 1844 | 1872 |