County
| FIPS Code [2] | County seat [3] | Established [3] | Formed from [4] | Etymology [4] | Population [3][5] | Area [3][5] | Map
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| Adams County | 001 | Friendship | 1848 | Portage County | John Quincy Adams (1767-1848), President of the United States 1825-1829 | &0000000000018643.00000018,643 | &0000000000000648.000000648 sq mi (&0000000000001678.0000001,678 km2) |
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| Ashland County | 003 | Ashland | 1860 | unorganized territory | Ashland, Henry Clay's estate in Kentucky | &0000000000016866.00000016,866 | &0000000000001044.0000001,044 sq mi (&0000000000002704.0000002,704 km2) |
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| Barron County | 005 | Barron | 1859 | Dallas and Polk counties | Henry D. Barron, legislator and circuit court judge. | &0000000000044963.00000044,963 | &0000000000000863.000000863 sq mi (&0000000000002235.0000002,235 km2) |
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| Bayfield County | 007 | Washburn | 1845 | Ashland County | Henry Bayfield, Royal naval officer and first to survey the Great Lakes area | &0000000000015013.00000015,013 | &0000000000001476.0000001,476 sq mi (&0000000000003823.0000003,823 km2) |
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| Brown County | 009 | Green Bay | 1818 | unorganized territory | Major General Jacob Brown (1775-1828), a commanding general of the United States Army during the War of 1812 | &0000000000226778.000000226,778 | &0000000000000529.000000529 sq mi (&0000000000001370.0000001,370 km2) |
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| Buffalo County | 011 | Alma | 1853 | Trempealeau County | The Buffalo River, which flows through the county. | &0000000000013804.00000013,804 | &0000000000000684.000000684 sq mi (&0000000000001772.0000001,772 km2) |
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| Burnett County | 013 | Siren | 1856 | Polk County | Thomas P. Burnett, state legislator | &0000000000015674.00000015,674 | &0000000000000822.000000822 sq mi (&0000000000002129.0000002,129 km2) |
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| Calumet County | 015 | Chilton | 1836 | unorganized territory | The French word for a Menominee peace pipe. | &0000000000040631.00000040,631 | &0000000000000320.000000320 sq mi (&0000000000000829.000000829 km2) |
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| Chippewa County | 017 | Chippewa Falls | 1845 | Crawford County | The Ojibwe nation of Native Americans (historically referred to as Chippewa) | &0000000000055195.00000055,195 | &0000000000001010.0000001,010 sq mi (&0000000000002616.0000002,616 km2) |
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| Clark County | 019 | Neillsville | 1853 | Crawford County | Either George Rogers Clark (1752-1812), Revolutionary War general, or A.W. Clark, founder of Clark's Mill | &0000000000033557.00000033,557 | &0000000000001216.0000001,216 sq mi (&0000000000003149.0000003,149 km2) |
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| Columbia County | 021 | Portage | 1846 | Portage County | Christopher Columbus (1451-1506), navigator and explorer | &0000000000052468.00000052,468 | &0000000000000774.000000774 sq mi (&0000000000002005.0000002,005 km2) |
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| Crawford County | 023 | Prairie du Chien | 1818 | unorganized territory | William Harris Crawford (1772-1834), United States Senator from Georgia 1807-1813 and Secretary of the Treasury 1816-1825 | &0000000000017243.00000017,243 | &0000000000000573.000000573 sq mi (&0000000000001484.0000001,484 km2) |
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| Dane County | 025 | Madison | 1836 | unorganized territory | Nathan Dane (1752-1835), delegate to the First Continental Congress 1785-1788 | &0000000000426526.000000426,526 | &0000000000001202.0000001,202 sq mi (&0000000000003113.0000003,113 km2) |
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| Dodge County | 027 | Juneau | 1836 | unorganized | Henry Dodge (1782-1867), Territorial Governor of Wisconsin 1848-1857 | &0000000000085897.00000085,897 | &0000000000000882.000000882 sq mi (&0000000000002284.0000002,284 km2) |
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| Door County | 029 | Sturgeon Bay | 1851 | Brown County | A dangerous water passage near Door Peninsula known as porte des morts, or "door of the dead" in French | &0000000000027961.00000027,961 | &0000000000000483.000000483 sq mi (&0000000000001251.0000001,251 km2) |
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| Douglas County | 031 | Superior | 1854 | unorganized | Stephen Douglas (1813-1861), United States Senator 1847-1861 | &0000000000043287.00000043,287 | &0000000000001309.0000001,309 sq mi (&0000000000003390.0000003,390 km2) |
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| Dunn County | 033 | Menomonie | 1854 | Chippewa County | Charles Dunn, state senator and chief justice of Wisconsin Territory | &0000000000039858.00000039,858 | &0000000000000852.000000852 sq mi (&0000000000002207.0000002,207 km2) |
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| Eau Claire County | 035 | Eau Claire | 1856 | Chippewa County | City of Eau Claire, itself French for "clear water" | &0000000000093142.00000093,142 | &0000000000000638.000000638 sq mi (&0000000000001652.0000001,652 km2) |
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| Florence County | 037 | Florence | 1882 | Marinette and Oconto Counties | Florence Julst, the first white woman to settle in the area | &0000000000005088.0000005,088 | &0000000000000488.000000488 sq mi (&0000000000001264.0000001,264 km2) |
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| Fond du Lac County | 039 | Fond du Lac | 1836 | unorganized territory | French for "bottom of the lake" | &0000000000097296.00000097,296 | &0000000000000723.000000723 sq mi (&0000000000001873.0000001,873 km2) |
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| Forest County | 041 | Crandon | 1885 | Langlade and Oconto Counties | Forest which covered the area when it was settled | &0000000000010024.00000010,024 | &0000000000001014.0000001,014 sq mi (&0000000000002626.0000002,626 km2) |
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| Grant County | 043 | Lancaster | 1836 | unorganized territory | A white Indian trader named Grant | &0000000000049597.00000049,597 | &0000000000001148.0000001,148 sq mi (&0000000000002973.0000002,973 km2) |
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| Green County | 045 | Monroe | 1836 | unorganized territory | Nathanael Greene (1742-1786), quartermaster general during the American Revolutionary War | &0000000000033647.00000033,647 | &0000000000000584.000000584 sq mi (&0000000000001513.0000001,513 km2) |
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| Green Lake County | 047 | Green Lake | 1858 | Marquette District | Green Lake, located within the county | &0000000000019105.00000019,105 | &0000000000000354.000000354 sq mi (&0000000000000917.000000917 km2) |
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| Iowa County | 049 | Dodgeville | 1829 | unorganized territory | Iowa tribe of Native Americans | &0000000000022780.00000022,780 | &0000000000000763.000000763 sq mi (&0000000000001976.0000001,976 km2) |
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| Iron County | 051 | Hurley | 1893 | Ashland and Onedia Counties | Local iron deposits | &0000000000006861.0000006,861 | &0000000000000757.000000757 sq mi (&0000000000001961.0000001,961 km2) |
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| Jackson County | 053 | Black River Falls | 1853 | La Crosse County | Andrew Jackson (1767-1845), President of the United States 1829–1837 | &0000000000019100.00000019,100 | &0000000000000987.000000987 sq mi (&0000000000002556.0000002,556 km2) |
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| Jefferson County | 055 | Jefferson | 1836 | Milwaukee County | Thomas Jefferson (1743-1826), President of the United States (1801-1809) | &0000000000074021.00000074,021 | &0000000000000557.000000557 sq mi (&0000000000001443.0000001,443 km2) |
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| Juneau County | 057 | Mauston | 1856 | Adams County | Solomon Juneau (1793-1856), founder of what would become Milwaukee | &0000000000024316.00000024,316 | &0000000000000768.000000768 sq mi (&0000000000001989.0000001,989 km2) |
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| Kenosha County | 059 | Kenosha | 1850 | Racine County | A Native American word meaning "place of the pike" | &0000000000149577.000000149,577 | &0000000000000273.000000273 sq mi (&0000000000000707.000000707 km2) |
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| Kewaunee County | 061 | Kewaunee | 1852 | Manitowoc County | Either a Pottowatomi word meaning "river of the lost" or a Ojibwe word meaning "praire hen", "wild duck" or "to go around" | &0000000000020187.00000020,187 | &0000000000000343.000000343 sq mi (&0000000000000888.000000888 km2) |
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| La Crosse County | 063 | La Crosse | 1851 | unorganized territory | The Native American version of lacrosse | &0000000000107120.000000107,120 | &0000000000000453.000000453 sq mi (&0000000000001173.0000001,173 km2) |
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| Lafayette County | 065 | Darlington | 1846 | Iowa County | Gilbert du Motier, marquis de La Fayette (1757-1834), a French general in the American Revolutionary War | &0000000000016137.00000016,137 | &0000000000000634.000000634 sq mi (&0000000000001642.0000001,642 km2) |
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| Langlade County | 067 | Antigo | 1879 | unorganized territory | Charles de Langlade (1729 – c.1800), American Revolutionary War veteran and United States Indian Agent in Green Bay | &0000000000020740.00000020,740 | &0000000000000873.000000873 sq mi (&0000000000002261.0000002,261 km2) |
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| Lincoln County | 069 | Merrill | 1874 | Marathon County | Abraham Lincoln (1809-1865), President of the United States 1861-1865 | &0000000000029641.00000029,641 | &0000000000000883.000000883 sq mi (&0000000000002287.0000002,287 km2) |
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| Manitowoc County | 071 | Manitowoc | 1836 | unorganized territory | Munedoo-owk, a Ojibwe word meaning "the place of the good spirit" | &0000000000082887.00000082,887 | &0000000000000592.000000592 sq mi (&0000000000001533.0000001,533 km2) |
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| Marathon County | 073 | Wausau | 1850 | Portage County | Marathon, Greece | &0000000000125834.000000125,834 | &0000000000001545.0000001,545 sq mi (&0000000000004002.0000004,002 km2) |
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| Marinette County | 075 | Marinette | 1879 | Oconto | Marinette, trading post owner | &0000000000043384.00000043,384 | &0000000000001402.0000001,402 sq mi (&0000000000003631.0000003,631 km2) |
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| Marquette County | 077 | Montello | 1836 | Marquette District | Father Pere Jacques Marquette, missionary and explorer | &0000000000015832.00000015,832 | &0000000000000456.000000456 sq mi (&0000000000001181.0000001,181 km2) |
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| Menominee County | 078 | Keshena | 1961 | Menominee Indian Reservation | Menominee nation of Native Americans | &0000000000004562.0000004,562 | &0000000000000358.000000358 sq mi (&0000000000000927.000000927 km2) |
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| Milwaukee County | 079 | Milwaukee | 1835 | unorganized territory | Mahnawaukee-Seepe, a Native American word meaning "gathering place by the river" | &0000000000940164.000000940,164 | &0000000000000242.000000242 sq mi (&0000000000000627.000000627 km2) |
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| Monroe County | 081 | Sparta | 1854 | La Crosse County | James Monroe (1758-1831), President of the United States 1817-1825 | &0000000000040899.00000040,899 | &0000000000000901.000000901 sq mi (&0000000000002334.0000002,334 km2) |
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| Oconto County | 083 | Oconto | 1851 | unorganized territory | A Native American settlement and the Oconto River, whose name means "plentiful with fish" | &0000000000035634.00000035,634 | &0000000000000998.000000998 sq mi (&0000000000002585.0000002,585 km2) |
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| Oneida County | 085 | Rhinelander | 1885 | Lincoln County | Oneida nation of Native Americans | &0000000000036776.00000036,776 | &0000000000001125.0000001,125 sq mi (&0000000000002914.0000002,914 km2) |
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| Outagamie County | 087 | Appleton | 1851 | Brown County | Outagamie nation of Native Americans | &0000000000160971.000000160,971 | &0000000000000640.000000640 sq mi (&0000000000001658.0000001,658 km2) |
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| Ozaukee County | 089 | Port Washington | 1853 | Milwaukee County | The Ojibwe word for the Sauk nation | &0000000000082317.00000082,317 | &0000000000000232.000000232 sq mi (&0000000000000601.000000601 km2) |
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| Pepin County | 091 | Durand | 1858 | Dunn County | Pierre and Jean Pepin du Chardonnets, explorers | &0000000000007213.0000007,213 | &0000000000000232.000000232 sq mi (&0000000000000601.000000601 km2) |
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| Pierce County | 093 | Ellsworth | 1853 | Saint Croix County | Franklin Pierce (1804-1869), President of the United States 1853-1857 | &0000000000036804.00000036,804 | &0000000000000576.000000576 sq mi (&0000000000001492.0000001,492 km2) |
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| Polk County | 095 | Balsam Lake | 1853 | Saint Croix County | James Polk (1745-1849), President of the United States (1845-1849) | &0000000000041319.00000041,319 | &0000000000000917.000000917 sq mi (&0000000000002375.0000002,375 km2) |
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| Portage County | 097 | Stevens Point | 1836 | unorganized territory | Passage between the Fox and Wisconsin Rivers | &0000000000067182.00000067,182 | &0000000000000806.000000806 sq mi (&0000000000002088.0000002,088 km2) |
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| Price County | 099 | Phillips | 1879 | Chippewa and Lincoln Counties | William T. Price, president of the Wisconsin Senate | &0000000000015822.00000015,822 | &0000000000001253.0000001,253 sq mi (&0000000000003245.0000003,245 km2) |
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| Racine County | 101 | Racine | 1836 | unorganized territory | Racine, the French word for "root", after the Root River, which flows through the county | &0000000000188831.000000188,831 | &0000000000000333.000000333 sq mi (&0000000000000862.000000862 km2) |
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| Richland County | 103 | Richland Center | 1842 | Iowa County | The rich soil of the area | &0000000000017924.00000017,924 | &0000000000000586.000000586 sq mi (&0000000000001518.0000001,518 km2) |
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| Rock County | 105 | Janesville | 1836 | unorganized territory | Rock River, which flows through the county | &0000000000152307.000000152,307 | &0000000000000720.000000720 sq mi (&0000000000001865.0000001,865 km2) |
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| Rusk County | 107 | Ladysmith | 1901 | Chippewa County | Jeremiah McLain Rusk (1830-1893), Governor of Wisconsin 1882-1889 | &0000000000015347.00000015,347 | &0000000000000913.000000913 sq mi (&0000000000002365.0000002,365 km2) |
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| Sauk County | 111 | Baraboo | 1840 | unorganized territory | Sauk nation of Native Americans | &0000000000055225.00000055,225 | &0000000000000838.000000838 sq mi (&0000000000002170.0000002,170 km2) |
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| Sawyer County | 113 | Hayward | 1883 | Oconto County | Philetus Sawyer (1816-1900), United States Representative (1865-1875) and Senator (1881-1893) from Wisconsin | &0000000000016196.00000016,196 | &0000000000001256.0000001,256 sq mi (&0000000000003253.0000003,253 km2) |
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| Shawano County | 115 | Shawano | 1853 | Oconto County | A Ojibwe word meaning "southern" | &0000000000040664.00000040,664 | &0000000000000893.000000893 sq mi (&0000000000002313.0000002,313 km2) |
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| Sheboygan County | 117 | Sheboygan | 1836 | unorganized territory | Shawb-wa-way-kun, a Native American word meaning "great noise underground" | &0000000000112646.000000112,646 | &0000000000000514.000000514 sq mi (&0000000000001331.0000001,331 km2) |
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| Saint Croix County | 109 | Hudson | 1840 | unorganized territory | St. Croix, French explorer | &0000000000063155.00000063,155 | &0000000000000722.000000722 sq mi (&0000000000001870.0000001,870 km2) |
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| Taylor County | 119 | Medford | 1875 | Clark, Lincoln, Marathon and Chippewa Counties | William Robert Taylor (1820-1909), Governor of Wisconsin 1874-1876 | &0000000000019680.00000019,680 | &0000000000000975.000000975 sq mi (&0000000000002525.0000002,525 km2) |
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| Trempealeau County | 121 | Whitehall | 1854 | Crawford and La Crosee Counties | Trempealeau Mountain (from the French for "mountain with its foot in the water"), a bluff located in a bend of the Trempealeau River,[6] which flows through the county[4] | &0000000000027010.00000027,010 | &0000000000000734.000000734 sq mi (&0000000000001901.0000001,901 km2) |  |
| Vernon County | 123 | Viroqua | 1851 | Richland and Crawford Counties | Mount Vernon, home of George Washington | &0000000000028056.00000028,056 | &0000000000000795.000000795 sq mi (&0000000000002059.0000002,059 km2) |
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| Vilas County | 125 | Eagle River | 1893 | Oneida County | William Vilas (1840-1908), officer in the Civil War, United States Postmaster General (1885-1888), United States Secretary of the Interior (1888-1889), and Senator from Wisconsin (1891-1897) | &0000000000021033.00000021,033 | &0000000000000874.000000874 sq mi (&0000000000002264.0000002,264 km2) |
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| Walworth County | 127 | Elkhorn | 1836 | unorganized territory | Reuben Hyde Walworth (1788-1867), jurist from New York | &0000000000093759.00000093,759 | &0000000000000555.000000555 sq mi (&0000000000001437.0000001,437 km2) |
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| Washburn County | 129 | Shell Lake | 1883 | Burnett County | Cadwallader Washburn (1818-1882), Governor of Wisconsin 1872–1874 and Representative from Wisconsin 1867–1871 | &0000000000016036.00000016,036 | &0000000000000810.000000810 sq mi (&0000000000002098.0000002,098 km2) |
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| Washington County | 131 | West Bend | 1836 | unorganized territory | George Washington (1732-1799), American Revolutionary War leader (1775–1783), and first President of the United States (1789–1797) | &0000000000117493.000000117,493 | &0000000000000431.000000431 sq mi (&0000000000001116.0000001,116 km2) |
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| Waukesha County | 133 | Waukesha | 1846 | Milwaukee County | Waugooshance, a Pottawatomi word meaning "little foxes" | &0000000000360767.000000360,767 | &0000000000000556.000000556 sq mi (&0000000000001440.0000001,440 km2) |
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| Waupaca County | 135 | Waupaca | 1851 | Brown and Winnebago Counties | wau-pa-ka-ho-nak, a Menominee word meaning "white sand bottom" or "brave young hero" | &0000000000051731.00000051,731 | &0000000000000751.000000751 sq mi (&0000000000001945.0000001,945 km2) |
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| Waushara County | 137 | Wautoma | 1851 | Marquette County | A Native American word meaning "good earth" | &0000000000023154.00000023,154 | &0000000000000626.000000626 sq mi (&0000000000001621.0000001,621 km2) |
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| Winnebago County | 139 | Oshkosh | 1840 | unorganized territory | Winnebago nation of Native Americans | &0000000000156763.000000156,763 | &0000000000000439.000000439 sq mi (&0000000000001137.0000001,137 km2) |
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| Wood County | 141 | Wisconsin Rapids | 1856 | Portage County | Joseph Wood (1809-1890), state legislator (1856-1858) | &0000000000075555.00000075,555 | &0000000000000793.000000793 sq mi (&0000000000002054.0000002,054 km2) |  |