Wisconsin's 15th Senate district explained

Image Caption:2024 map defined in
2022 map defined in Johnson v. Wisconsin Elections Commission
2011 map was defined in
composed of Assembly districts 43, 44, and 45
Chamber:Senate
State:Wisconsin
District:15
Representative:Mark Spreitzer
Residence:Beloit
Party:Democratic
Incumbentsince:January 3, 2023 (years)
Population:178,585
Population Year:2020
Voting Age:139,484
Percent White:82.79
Percent Black:5.35
Percent Hispanic:7.84
Percent Asian:1.76
Percent Native American:1.93
Percent Pacific Islander:0.12
Website:Official website
Notes:Southern Wisconsin

The 15th Senate district of Wisconsin is one of 33 districts in the Wisconsin Senate.[1] 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.[2]

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.[3]

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:[4]

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.[5]

Past senators

The district has previously been represented by:[6]

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.

SenatorPartyNotesSessionYearsDistrict Definition
District created1848 Rock County
Otis NortonWhig1st
2nd1849
3rd1850
Andrew PalmerDem.4th1851
5th1852
Levi SterlingWhig6th1853


Iowa & Richland counties
7th1854
Amasa CobbRep.8th1855
9th1856
Lemuel W. JoinerRep.10th1857
11th1858
Charles RodolfDem.12th1859
13th1860
Lemuel W. JoinerRep.14th1861
15th1862


Iowa County
George L. FrostDem.16th1863
17th1864
Wyman Lincoln18th1865
19th1866
Joel Whitman20th1867
Rep.21st1868
Lemuel W. JoinerRep.22nd1869
23rd1870
align=left Francis LittleRep.Redistricted to 9th district24th1871
Carl H. SchmidtDem.Redistricted from 19th district25th1872




Manitowoc County
26th1873
27th1874
John SchuetteRep.28th1875
29th1876
Joseph RankinDem.30th1877
31st1878
32nd1879
33rd1880
34th1881
35th1882
John CareyDem.36th1883–1884
37th1885–1886
38th1887–1888
William F. NashDem.Won 1888 special election.39th1889–1890 Kewaunee & Manitowoc counties
40th1891–1892
41st1893–1894






Calumet & Manitowoc counties
John McMullenDem.42nd1895–1896
43rd1897–1898
Norman KnudsonRep.44th1899–1900
45th1901–1902
Samuel W. RandolphDem.46th1903–1904
47th1905–1906
48th1907–1908
49th1909–1910
50th1911–1912
51st1913–1914
Henry RollmanDem.52nd1915–1916
53rd1917–1918
Henry KleistSoc.54th1919–1920
55th1921–1922
Alva GareyRep.56th1923–1924


Rock County
57th1925–1926
George W. BlanchardRep.Resigned 1933 after election to 58th1927–1928
59th1929–1930
60th1931–1932
61st1933–1934
—Vacant--
align=left Alexander PaulDem.Won 1933 special election.
Maurice CoakleyRep.62nd1935–1936
63rd1937–1938
64th1939–1940
65th1941–1942
Robert P. RobinsonRep.66th1943–1944
67th1945–1946
68th1947–1948
69th1949–1950
70th1951–1952
71st1953–1954
Peter P. CarrRep.72nd1955–1956
73rd1957–1958
74th1959–1960
75th1961–1962
76th1963–1964
77th1965–1966 Walworth County &<br />
align=left George M. BorgRep.Resigned Aug. 1967.78th1967–1968
—Vacant--
James D. SwanRep.Won 1967 special election.
79th1969–1970
80th1971–1972
81st1973–1974
Dem.Resigned 1987 after appointed Secretary of Wisconsin Department of Health Services.82nd1975–1976
83rd1977–1978
84th1979–1980
85th1981–1982
86th1983–1984Most of Walworth County
87th1985–1986Most of Walworth County
—Vacant--88th1987–1988
Timothy WeedenRep.Won 1987 special election.
89th1989–1990
90th1991–1992
91st1993–1994
92nd1995–1996
93rd1997–1998
Judy RobsonDem.94th1999–2000
95th2001–2002
96th2003–2004


97th2005–2006
98th2007–2008
99th2009–2010
Timothy CullenDem.100th2011–2012
101st2013–2014 Most of Rock County
Southeast Green County
Southeast Dane County
Dem.102nd2015–2016
103rd2017–2018
104th2019–2020
105th2021–2022
align=left Dem.Elected 2022.106th2023–2024 Southeast Dane County,
parts of Green County,
western Rock County

External links

Notes and References

  1. Web site: Senate District 15 . . March 9, 2021 .
  2. Web site: Wisconsin Legislative Districts - Senate District 15 Boundaries . . March 9, 2021 .
  3. Web site: Senator Mark Spreitzer . . January 3, 2023 .
  4. Book: Wisconsin Blue Book, 2011-12 edition, page 48. 978-0-9752820-1-4.
  5. Web site: State of Wisconsin Congressional Districts . . March 7, 2021 .
  6. Wisconsin Blue Book, 1991-92 edition, Statistics: History, pages 657-666.

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