The 15th Senate district of Wisconsin is one of 33 districts in the Wisconsin Senate. Located in southern Wisconsin, the district comprises most of Rock County and parts of northwest Walworth County and southern Jefferson County. It includes the cities of Janesville, Beloit, Edgerton, Evansville, Milton, and Whitewater.
Current elected officials Mark Spreitzer is the senator representing the 15th district since January 2023. He previously served in the State Assembly, representing the 45th Assembly district from 2015 to 2023.
Each Wisconsin State Senate district is composed of three Wisconsin State Assembly districts. The 15th Senate district comprises the 43rd, 44th, and 45th Assembly districts. The current representatives of those districts are: Assembly District 43: Brienne Brown (D–Whitewater) Assembly District 44: Ann Roe (D–Janesville) Assembly District 45: Clinton Anderson (D–Beloit)
The 15th Senate district, in its current borders, crosses three different congressional districts. The portion of the district in Jefferson County falls within Wisconsin's 5th congressional district, which is represented by U.S. Representative Scott L. Fitzgerald; the portion in Walworth County and the cities of Janesville and Milton and the eastern part of Rock County fall within Wisconsin's 1st congressional district, which is represented by U.S. Representative Bryan Steil; the remainder of the district, in the western half of Rock county, falls within 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 1848 Rock County Otis Norton Whig 1st 2nd 1849 3rd 1850 Andrew Palmer Dem. 4th 1851 5th 1852 Levi Sterling Whig 6th 1853 Iowa & Richland counties 7th 1854 Amasa Cobb Rep. 8th 1855 9th 1856 Lemuel W. Joiner Rep. 10th 1857 11th 1858 Charles Rodolf Dem. 12th 1859 13th 1860 Lemuel W. Joiner Rep. 14th 1861 15th 1862 Iowa County George L. Frost Dem. 16th 1863 17th 1864 Wyman Lincoln 18th 1865 19th 1866 Joel Whitman 20th 1867 Rep. 21st 1868 Lemuel W. Joiner Rep. 22nd 1869 23rd 1870 Francis Little Rep. Redistricted to 9th district 24th 1871 Carl H. Schmidt Dem. Redistricted from 19th district 25th 1872 Manitowoc County 26th 1873 27th 1874 John Schuette Rep. 28th 1875 29th 1876 Joseph Rankin Dem. 30th 1877 31st 1878 32nd 1879 33rd 1880 34th 1881 35th 1882 John Carey Dem. 36th 1883–1884 37th 1885–1886 38th 1887–1888 William F. Nash Dem. Won 1888 special election. 39th 1889–1890 Kewaunee & Manitowoc counties 40th 1891–1892 41st 1893–1894 Calumet & Manitowoc counties John McMullen Dem. 42nd 1895–1896 43rd 1897–1898 Norman Knudson Rep. 44th 1899–1900 45th 1901–1902 Samuel W. Randolph Dem. 46th 1903–1904 47th 1905–1906 48th 1907–1908 49th 1909–1910 50th 1911–1912 51st 1913–1914 Henry Rollman Dem. 52nd 1915–1916 53rd 1917–1918 Henry Kleist Soc. 54th 1919–1920 55th 1921–1922 Alva Garey Rep. 56th 1923–1924 Rock County 57th 1925–1926 George W. Blanchard Rep. Resigned 1933 after election to 58th 1927–1928 59th 1929–1930 60th 1931–1932 61st 1933–1934 —Vacant-- Alexander Paul Dem. Won 1933 special election. Maurice Coakley Rep. 62nd 1935–1936 63rd 1937–1938 64th 1939–1940 65th 1941–1942 Robert P. Robinson Rep. 66th 1943–1944 67th 1945–1946 68th 1947–1948 69th 1949–1950 70th 1951–1952 71st 1953–1954 Peter P. Carr Rep. 72nd 1955–1956 73rd 1957–1958 74th 1959–1960 75th 1961–1962 76th 1963–1964 77th 1965–1966 Walworth County & George M. Borg Rep. Resigned Aug. 1967. 78th 1967–1968 —Vacant-- James D. Swan Rep. Won 1967 special election. 79th 1969–1970 80th 1971–1972 81st 1973–1974 Timothy Cullen Dem. Resigned 1987 after appointed Secretary of Wisconsin Department of Health Services. 82nd 1975–1976 83rd 1977–1978 84th 1979–1980 85th 1981–1982 86th 1983–1984 Most of Walworth County 87th 1985–1986 Most of Walworth County —Vacant-- 88th 1987–1988 Timothy Weeden Rep. Won 1987 special election. 89th 1989–1990 90th 1991–1992 91st 1993–1994 92nd 1995–1996 93rd 1997–1998 Judy Robson Dem. 94th 1999–2000 95th 2001–2002 96th 2003–2004 97th 2005–2006 98th 2007–2008 99th 2009–2010 Timothy Cullen Dem. 100th 2011–2012 101st 2013–2014 Most of Rock CountySoutheast Green CountySoutheast Dane County Dem. 102nd 2015–2016 103rd 2017–2018 104th 2019–2020 105th 2021–2022 Dem. Elected 2022. 106th 2023–2024 Southeast Dane County,parts of Green County,western Rock County 107th 2025–2026
References
External links Senate District 15 at Wisconsin Legislature Senator Mark Spreitzer (2023) Senator Janis A. Ringhand (2021) Senator Janis A. Ringhand (2019) Senator Janis A. Ringhand (2017)