Wisconsin's 15th
State Senate district
2022 map defined in Johnson v. Wisconsin Elections Commission
2011 map was defined in 2011 Wisc. Act 43
composed of Assembly districts 43, 44, and 45
Senator
  Mark Spreitzer
D–Beloit
since January 3, 2023 (0 years)
Demographics81.8% White
5.5% Black
8.1% Hispanic
1.7% Asian
1.3% Native American
0.1% Hawaiian/Pacific Islander
1.2% Other
Population (2020)
 • Voting age		179,118[1]
137,898

The 15th Senate District of Wisconsin is one of 33 districts in the Wisconsin State Senate.[2] Located in southern Wisconsin, the district comprises western Rock County, parts of eastern and northern Green County, and southeast Dane County. It includes the cities of Janesville, Brodhead, Edgerton, Evansville, and Stoughton, as well as the western half of the city of Beloit.[3]

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.[4]

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:[5]

The 15th Senate district, in its current borders, crosses three different congressional districts. The portion of the district in Jefferson County, and the city of Whitewater, which is partly in Walworth County, falls within Wisconsin's 5th congressional district, which is represented by U.S. Representative Scott L. Fitzgerald; the remainder of 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 Dane, Green, and Rock counties, falls within Wisconsin's 2nd congressional district, which is represented by U.S. Representative Mark Pocan.[6]

Past senators

The district has previously been represented by:[7]

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
1852–1855

1856–1860
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
1861–1865

1866–1870
Iowa County
George L. Frost Dem. 16th 1863
17th 1864
Wyman Lincoln Natl. Union 18th 1865
19th 1866
Joel Whitman Natl. Union 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
1871–1875

1876–1881

1882–1887
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
1892–1895

1896–1901

1902–1911

1912–1921
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
1922–1953

1954–1963
Rock County
57th 1925–1926
George W. Blanchard Rep. Resigned 1933 after election to U.S. House. 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 &
eastern Rock 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

Western Racine County,
eastern Rock County,
& most of Walworth County
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
Southeast and central Rock County
87th 1985–1986 Most of Walworth County
South and central Rock County
—Vacant-- 88th 1987–1988
Timothy Weeden Rep. Won 1987 special election.
89th 1989–1990
90th 1991–1992
91st 1993–1994

South and east Rock County
92nd 1995–1996
93rd 1997–1998
Judy Robson Dem. 94th 1999–2000
95th 2001–2002
96th 2003–2004
Most of Rock County

Part of Northwest Walworth County


Part of Dane County
97th 2005–2006
98th 2007–2008
99th 2009–2010
Timothy Cullen Dem. 100th 2011–2012
101st 2013–2014
Most of Rock County
Southeast Green County
Southeast Dane County
Part of northwest Walworth County
Janis Ringhand Dem. 102nd 2015–2016
103rd 2017–2018
104th 2019–2020
105th 2021–2022
Mark Spreitzer Dem. Elected 2022. 106th 2023–2024
Southeast Dane County,
parts of Green County,
western Rock County

References

  1. ↑ "LTSB Open Data: Wisconsin Senate Districts (2022)". Wisconsin Legislative Technology Services Bureau. Retrieved November 19, 2022.
  2. ↑ "Senate District 15". Wisconsin Legislature. Retrieved March 9, 2021.
  3. ↑ "Wisconsin Legislative Districts - Senate District 15 Boundaries". Wisconsin Legislature. Retrieved March 9, 2021.
  4. ↑ "Senator Mark Spreitzer". Wisconsin Legislature. Retrieved January 3, 2023.
  5. ↑ Wisconsin Blue Book, 2011-12 edition, page 48. ISBN 978-0-9752820-1-4.
  6. ↑ "State of Wisconsin Congressional Districts" (PDF). Wisconsin Legislature. Retrieved March 7, 2021.
  7. ↑ Wisconsin Blue Book, 1991-92 edition, Statistics: History, pages 657-666.
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