The 27th Senate district of Wisconsin is one of 33 districts in the Wisconsin Senate. Located in south-central Wisconsin, the district comprises most of the northwest quadrant of Dane County. It includes much of the west side of the city of Madison, as well as portions of Madison's far north side. The 27th also includes the suburban cities of Middleton and Verona, and the villages of Black Earth, Cross Plains, Dane, Mazomanie, and Waunakee.
Current elected officials Dianne Hesselbein is the senator representing the 27th district since January 2023. She previously served ten years in the Wisconsin State Assembly, representing the 79th district.
Each Wisconsin State Senate district is composed of three Wisconsin State Assembly districts. The 27th Senate district comprises the 79th, 80th, and 81st Assembly districts. The current representatives of those districts are: Assembly District 79: Lisa Subeck (D–Madison) Assembly District 80: Mike Bare (D–Verona) Assembly District 81: Alex Joers (D–Middleton)
The district is located entirely Wisconsin's 2nd congressional district, which is represented by U.S. Representative Mark Pocan.
Past senators The district has previously been represented by:Wisconsin Blue Book, 1991-92 edition, Statistics: History, pages 657-666.
Note: the boundaries of districts have changed repeatedly over history. Previous politicians of a specific numbered district have represented a completely different geographic area, due to redistricting.
Senator Party Notes Session Years District Definition District created by 1856 Wisc. Act 109. 1856 Marathon, Portage, Waupaca, Waushara, and Wood counties Luther Hanchett Rep. 10th 1857 11th 1858 12th 1859 13th 1860 Edward L. Browne Rep. 14th 1861 15th 1862 Marathon, Portage, Waupaca, and Wood counties Alexander S. McDill Rep. 16th 1863 17th 1864 Milan H. Sessions 18th 1865 19th 1866 Edward L. Browne 20th 1867 21st 1868 Charles M. Webb Rep. 22nd 1869 23rd 1870 Myron Reed Dem. Redistricted to 21st district. 24th 1871 William M. Griswold Rep. Redistricted from 25th district. 25th 1872 Columbia County Evan O. Jones Rep. 26th 1873 27th 1874 Levi W. Barden Rep. 28th 1875 29th 1876 30th 1877 Adams and Columbia counties 31st 1878 Charles L. Dering Rep. 32nd 1879 33rd 1880 Gilbert E. McKeeby Rep. 34th 1881 35th 1882 Adams, Columbia, and Marquette counties William T. Parry Rep. 36th 1883–1884 37th 1885–1886 Levi E. Pond Rep. 38th 1887–1888 39th 1889–1890 Russell C. Falconer Dem. 40th 1891–1892 41st 1893–1894 Sauk County and Western Columbia County William F. Conger Rep. 42nd 1895–1896 43rd 1897–1898 Columbia and Sauk counties William G. Bissell Rep. 44th 1899–1900 45th 1901–1902 George Wylie Rep. 46th 1903–1904 47th 1905–1906 Charles L. Pearson Dem. 48th 1907–1908 49th 1909–1910 John M. True Rep. 50th 1911–1912 51st 1913–1914 George Staudenmayer Dem. 52nd 1915–1916 53rd 1917–1918 Rep. 54th 1919–1920 55th 1921–1922 56th 1923–1924 Columbia, Richland, and Sauk counties 57th 1925–1926 Robert Caldwell Rep. 58th 1927–1928 59th 1929–1930 Fred W. Zantow Rep. 60th 1931–1932 61st 1933–1934 E. Myrwyn Rowlands Prog. 62nd 1935–1936 63rd 1937–1938 Jess Miller Rep. Died Dec. 1965. 64th 1939–1940 65th 1941–1942 66th 1943–1944 67th 1945–1946 68th 1947–1948 69th 1949–1950 70th 1951–1952 71st 1953–1954 72nd 1955–1956 Columbia, Crawford, Richland, and Sauk counties 73rd 1957–1958 74th 1959–1960 75th 1961–1962 76th 1963–1964 77th 1965–1966 Adams, Columbia, Juneau, Marquette, and Sauk counties --Vacant-- Walter Terry Rep. 78th 1967–1968 79th 1969–1970 Everett Bidwell Rep. 80th 1971–1972 81st 1973–1974 Columbia, Marquette, and Sauk counties and Southern Adams CountyWestern Dodge CountySouthern Juneau CountyPart of Jefferson County 82nd 1975–1976 83rd 1977–1978 84th 1979–1980 85th 1981–1982 Russ Feingold Dem. Resigned 1992 after elected to United States Senate. 86th 1983–1984 Columbia County and Most of Sauk CountyMost of Richland CountyNorthwest Dane CountyWestern Dodge County 87th 1985–1986 Columbia County and Western Dane CountyPart of Dodge CountyPart of Green CountyPart of Rock CountyPart of Sauk County 88th 1987–1988 89th 1989–1990 90th 1991–1992 --Vacant-- 91st 1993–1994 Green County and Western Dane CountyWestern Rock County Joe Wineke Dem. Won 1993 special election. 92nd 1995–1996 93rd 1997–1998 Jon Erpenbach Dem. 94th 1999–2000 95th 2001–2002 96th 2003–2004 Green County and Western Dane CountyPart of Lafayette CountyPart of Rock County 97th 2005–2006 98th 2007–2008 99th 2009–2010 100th 2011–2012 101st 2013–2014 Western Dane CountyMost of Sauk CountyEastern Iowa CountyPart of Columbia CountyPart of Green County 102nd 2015–2016 103rd 2017–2018 104th 2019–2020 105th 2021–2022 Dianne Hesselbein Dem. Elected 2022. 106th 2023–2024 Western Dane County,eastern Sauk Countyeastern Iowa Countyparts of Columbia Countynorthwest Green County 107th 2025–2026 Northwest Dane County
References
External links Senate District 27 at Wisconsin Legislature Senator Dianne H. Hesselbein (2025) Senator Dianne H. Hesselbein (2023) Senator Jon Erpenbach (2021) Senator Jon Erpenbach (2019) Senator Jon Erpenbach (2017)