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Wisconsin's 15th Senate district

American legislative district in southern Wisconsin

Field	Value
image	{{switcher
{{maplink	frame	yes	plain=yes	from=Wisconsin's 15th Senate district (2024–2031).map	frame-height=300	frame-width=400	frame-coord=	frame-longitude=-77.2	zoom=9	overlay-horizontal-alignment=right	overlay-vertical-alignment=bottom	overlay=[[File:2024 WI Sen 15.svg	100px]] }}
{{maplink	frame	yes	plain=yes	from=Wisconsin's 15th Senate district (2022–2023).map	frame-height=300	frame-width=400	frame-coord=	frame-longitude=-77.2	zoom=9	overlay-horizontal-alignment=right	overlay-vertical-alignment=bottom	overlay=[[File:2024 WI Sen 15.svg	100px]] }}
{{maplink	frame	yes	plain=yes	from=Wisconsin's 15th Senate district (2012–2021).map	frame-height=300	frame-width=400	frame-coord=	frame-longitude=-77.2	zoom=9	overlay-horizontal-alignment=right	overlay-vertical-alignment=bottom	overlay=[[File:2024 WI Sen 15.svg	100px]] }}
image caption	2024 map defined in [2023 Wisc. Act 94](https://docs.legis.wisconsin.gov/2023/related/acts/94)
2022 map defined in [ Johnson v. Wisconsin Elections Commission](https://www.wicourts.gov/sc/opinion/DisplayDocument.pdf?content=pdf&seqNo=512188)
2011 map was defined in [2011 Wisc. Act 43](https://docs.legis.wisconsin.gov/2011/related/acts/43)
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 ()
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](https://docs.legis.wisconsin.gov/districts/senate/15)
notes	Southern Wisconsin

| | From 2024 to 2031 | | From 2022 to 2023 | | From 2012 to 2021 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

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.

File:Whitewater_Wisconsin_Downtown_Looking_East.jpg|Main Street in downtown Whitewater File:North side of Fulton Street, Edgerton, WI.JPG|Fulton Street Historic District in Edgerton File:Lappin-Hayes Block 2.JPG|Lappin-Hayes Block in downtown Janesville File:Janesville Armory 3.JPG|Historic Janesville Armory File:Courthouse Hill Historic District 3.JPG|Courthouse Hill Historic District File:Downtown Beloit, Wisconsin.jpg|Downtown Beloit File:JOHNSON 20131025 790 (2)resize.jpg|Middle College, part of Beloit College

Past senators

The district has previously been represented by:

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	[[File:1848 WI Sen 15.svg	frameless	center	150px]] Rock County
Otis Norton	Whig		[1st](1st-wisconsin-legislature)
[2nd](2nd-wisconsin-legislature)	1849
[3rd](3rd-wisconsin-legislature)	1850
Andrew Palmer	Dem.		[4th](4th-wisconsin-legislature)	1851
[5th](5th-wisconsin-legislature)	1852
Levi Sterling	Whig		[6th](6th-wisconsin-legislature)	1853	[[File:1852 WI Sen 15.svg	frameless	center	150px]] 1852–1855
[[File:1856 WI Sen 15.svg	frameless	center	150px]] 1856–1860
Iowa & Richland counties
[7th](7th-wisconsin-legislature)	1854
Amasa Cobb	Rep.		[8th](8th-wisconsin-legislature)	1855
[9th](9th-wisconsin-legislature)	1856
Lemuel W. Joiner	Rep.		[10th](10th-wisconsin-legislature)	1857
[11th](11th-wisconsin-legislature)	1858
Charles Rodolf	Dem.		[12th](12th-wisconsin-legislature)	1859
[13th](13th-wisconsin-legislature)	1860
Lemuel W. Joiner	Rep.		[14th](14th-wisconsin-legislature)	1861
[15th](15th-wisconsin-legislature)	1862	[[File:1861 WI Sen 15.svg	frameless	center	150px]] 1861–1865
[[File:1866 WI Sen 15.svg	frameless	center	150px]] 1866–1870
Iowa County
George L. Frost	Dem.		[16th](16th-wisconsin-legislature)	1863
[17th](17th-wisconsin-legislature)	1864
Wyman Lincoln	Natl. Union		[18th](18th-wisconsin-legislature)	1865
[19th](19th-wisconsin-legislature)	1866
Joel Whitman		Natl. Union		[20th](20th-wisconsin-legislature)	1867
	Rep.	[21st](21st-wisconsin-legislature)	1868
Lemuel W. Joiner	Rep.		[22nd](22nd-wisconsin-legislature)	1869
[23rd](23rd-wisconsin-legislature)	1870
Francis Little		Rep.	Redistricted to 9th district	[24th](24th-wisconsin-legislature)	1871
Carl H. Schmidt	Dem.	Redistricted from 19th district	[25th](25th-wisconsin-legislature)	1872	[[File:1871 WI Sen 15.svg	frameless	center	150px]] 1871–1875
[[File:1876 WI Sen 15.svg	frameless	center	150px]] 1876–1881
[[File:1882 WI Sen 15.svg	frameless	center	150px]] 1882–1887
Manitowoc County
[26th](26th-wisconsin-legislature)	1873
[27th](27th-wisconsin-legislature)	1874
John Schuette	Rep.		[28th](28th-wisconsin-legislature)	1875
[29th](29th-wisconsin-legislature)	1876
Joseph Rankin	Dem.		[30th](30th-wisconsin-legislature)	1877
[31st](31st-wisconsin-legislature)	1878
[32nd](32nd-wisconsin-legislature)	1879
[33rd](33rd-wisconsin-legislature)	1880
[34th](34th-wisconsin-legislature)	1881
[35th](35th-wisconsin-legislature)	1882
John Carey	Dem.		[36th](36th-wisconsin-legislature)	1883–1884
[37th](37th-wisconsin-legislature)	1885–1886
[38th](38th-wisconsin-legislature)	1887–1888
William F. Nash	Dem.	Won 1888 special election.	[39th](39th-wisconsin-legislature)	1889–1890	[[File:1888 WI Sen 15.svg	frameless	center	150px]] Kewaunee & Manitowoc counties
[40th](40th-wisconsin-legislature)	1891–1892
[41st](41st-wisconsin-legislature)	1893–1894	[[File:1892 WI Sen 15.svg	frameless	center	150px]] 1892–1895
[[File:1896 WI Sen 15.svg	frameless	center	150px]] 1896–1901
[[File:1902 WI Sen 15.svg	frameless	center	150px]] 1902–1911
[[File:1912 WI Sen 15.svg	frameless	center	150px]] 1912–1921
Calumet & Manitowoc counties
John McMullen	Dem.		[42nd](42nd-wisconsin-legislature)	1895–1896
[43rd](43rd-wisconsin-legislature)	1897–1898
Norman Knudson	Rep.		[44th](44th-wisconsin-legislature)	1899–1900
[45th](45th-wisconsin-legislature)	1901–1902
Samuel W. Randolph	Dem.		[46th](46th-wisconsin-legislature)	1903–1904
[47th](47th-wisconsin-legislature)	1905–1906
[48th](48th-wisconsin-legislature)	1907–1908
[49th](49th-wisconsin-legislature)	1909–1910
[50th](50th-wisconsin-legislature)	1911–1912
[51st](51st-wisconsin-legislature)	1913–1914
Henry Rollman	Dem.		[52nd](52nd-wisconsin-legislature)	1915–1916
[53rd](53rd-wisconsin-legislature)	1917–1918
Henry Kleist	Soc.		[54th](54th-wisconsin-legislature)	1919–1920
[55th](55th-wisconsin-legislature)	1921–1922
Alva Garey	Rep.		[56th](56th-wisconsin-legislature)	1923–1924	[[File:1922 WI Sen 15.svg	frameless	center	150px]] 1922–1953
[[File:1954 WI Sen 15.svg	frameless	center	150px]] 1954–1963
Rock County
[57th](57th-wisconsin-legislature)	1925–1926
George W. Blanchard	Rep.	Resigned 1933 after election to U.S. House.	[58th](58th-wisconsin-legislature)	1927–1928
[59th](59th-wisconsin-legislature)	1929–1930
[60th](60th-wisconsin-legislature)	1931–1932
[61st](61st-wisconsin-legislature)	1933–1934
—Vacant--
Alexander Paul		Dem.	Won 1933 special election.
Maurice Coakley	Rep.		[62nd](62nd-wisconsin-legislature)	1935–1936
[63rd](63rd-wisconsin-legislature)	1937–1938
[64th](64th-wisconsin-legislature)	1939–1940
[65th](65th-wisconsin-legislature)	1941–1942
Robert P. Robinson	Rep.		[66th](66th-wisconsin-legislature)	1943–1944
[67th](67th-wisconsin-legislature)	1945–1946
[68th](68th-wisconsin-legislature)	1947–1948
[69th](69th-wisconsin-legislature)	1949–1950
[70th](70th-wisconsin-legislature)	1951–1952
[71st](71st-wisconsin-legislature)	1953–1954
Peter P. Carr	Rep.		[72nd](72nd-wisconsin-legislature)	1955–1956
[73rd](73rd-wisconsin-legislature)	1957–1958
[74th](74th-wisconsin-legislature)	1959–1960
[75th](75th-wisconsin-legislature)	1961–1962
[76th](76th-wisconsin-legislature)	1963–1964
[77th](77th-wisconsin-legislature)	1965–1966	[[File:1964 WI Sen 15.svg	frameless	center	150px]] Walworth County &
{{Collapsible list	title=eastern Rock County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
George M. Borg		Rep.	Resigned Aug. 1967.	[78th](78th-wisconsin-legislature)	1967–1968
—Vacant--
James D. Swan	Rep.	Won 1967 special election.
[79th](79th-wisconsin-legislature)	1969–1970
[80th](80th-wisconsin-legislature)	1971–1972
[81st](81st-wisconsin-legislature)	1973–1974	[[File:1972 WI Sen 15.svg	frameless	center	150px]] {{Collapsible list	title=
Western Racine County,
eastern Rock County,
& most of Walworth County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
Timothy Cullen	Dem.	Resigned 1987 after appointed Secretary of Wisconsin Department of Health Services.	[82nd](82nd-wisconsin-legislature)	1975–1976
[83rd](83rd-wisconsin-legislature)	1977–1978
[84th](84th-wisconsin-legislature)	1979–1980
[85th](85th-wisconsin-legislature)	1981–1982
[86th](86th-wisconsin-legislature)	1983–1984	Most of Walworth County
{{Collapsible list	title=Southeast and central Rock County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
[87th](87th-wisconsin-legislature)	1985–1986	Most of Walworth County
{{Collapsible list	title=South and central Rock County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
—Vacant--	[88th](88th-wisconsin-legislature)	1987–1988
Timothy Weeden	Rep.	Won 1987 special election.
[89th](89th-wisconsin-legislature)	1989–1990
[90th](90th-wisconsin-legislature)	1991–1992
[91st](91st-wisconsin-legislature)	1993–1994	{{Collapsible list	title=Most Walworth County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
[92nd](92nd-wisconsin-legislature)	1995–1996
[93rd](93rd-wisconsin-legislature)	1997–1998
Judy Robson	Dem.		[94th](94th-wisconsin-legislature)	1999–2000
[95th](95th-wisconsin-legislature)	2001–2002
[96th](96th-wisconsin-legislature)	2003–2004	{{Collapsible list	title=Most of Rock County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
[97th](97th-wisconsin-legislature)	2005–2006
[98th](98th-wisconsin-legislature)	2007–2008
[99th](99th-wisconsin-legislature)	2009–2010
Timothy Cullen	Dem.		[100th](100th-wisconsin-legislature)	2011–2012
[101st](101st-wisconsin-legislature)	2013–2014	[[File:2011 WI Sen 15.png	frameless	center	300px]] Most of Rock County
Southeast Green County
Southeast Dane County
{{Collapsible list	title=Southwest Jefferson County	titlestyle=background:transparent;text-align:center;padding-center:1.0em;font-size:85%;
Janis Ringhand	Dem.		[102nd](102nd-wisconsin-legislature)	2015–2016
[103rd](103rd-wisconsin-legislature)	2017–2018
[104th](104th-wisconsin-legislature)	2019–2020
[105th](105th-wisconsin-legislature)	2021–2022
Mark Spreitzer	Dem.	Elected 2022.	[106th](106th-wisconsin-legislature)	2023–2024	[[File:2022 WI Sen 15.png	frameless	center	300px]] Southeast Dane County,
parts of Green County,
western Rock County
[107th](107th-wisconsin-legislature)	2025–2026	[[File:2024 WI Sen 15.svg	frameless	center	150px]]

References

"Senate District 15".
"Wisconsin Legislative Districts - Senate District 15 Boundaries".
"Senator Mark Spreitzer".
"Wisconsin Blue Book, 2011-12 edition, page 48".
"State of Wisconsin Congressional Districts".
Wisconsin Blue Book, 1991-92 edition, ''Statistics: History'', pages 657-666.

Info: Wikipedia Source

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