Wisconsin's 27th Senate district

Wisconsin's 27th
State Senate district
Wisconsin's 27th; State Senate district
	2024 map defined in 2023 Wisc. Act 94; 2022 map defined in Johnson v. Wisconsin Elections Commission; 2011 map was defined in 2011 Wisc. Act 43; composed of Assembly districts 79, 80, and 81
Senator
	Dianne Hesselbein; D–Middleton
	since January 3, 2023 (1 years)
Demographics	80.11% White; 4.56% Black; 5.47% Hispanic; 8.27% Asian; 1.29% Native American; 0.09% Hawaiian/Pacific Islander
Population (2020); • Voting age	179,647; 141,303
Website	Official website
Notes	South-central Wisconsin

The 27th Senate district of Wisconsin is one of 33 districts in the Wisconsin Senate.^[1] 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.^[2]

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.^[3]

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: Alex Joers (D–Middleton)
Assembly District 80: Mike Bare (D–Verona)
Assembly District 81: Dave Considine (D–Baraboo)^[4]

The district is located entirely 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.

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
Edward L. Browne	Rep.		15th	1862	Marathon, Portage, Waupaca, and Wood counties
Alexander S. McDill	Rep.		16th	1863
Alexander S. McDill	Natl. Union		17th	1864
Milan H. Sessions	Natl. Union		18th	1865
Milan H. Sessions	Natl. Union		19th	1866
Edward L. Browne	Natl. Union		20th	1867
Edward L. Browne	Natl. Union		21st	1868
Charles M. Webb	Rep.		22nd	1869
Charles M. Webb	Rep.		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
Evan O. Jones	Rep.		27th	1874
Levi W. Barden	Rep.		28th	1875
			29th	1876
			30th	1877	Adams and Columbia counties
			31st	1878
Charles L. Dering	Rep.		32nd	1879
Charles L. Dering	Rep.		33rd	1880
Gilbert E. McKeeby	Rep.		34th	1881
Gilbert E. McKeeby	Rep.		35th	1882	Adams, Columbia, and Marquette counties 1880 population: 43,713 1885 population: 46,263
William T. Parry	Rep.		36th	1883–1884
William T. Parry	Rep.		37th	1885–1886
Levi E. Pond	Rep.		38th	1887–1888
Levi E. Pond	Rep.		39th	1889–1890
Russell C. Falconer	Dem.		40th	1891–1892
Russell C. Falconer	Dem.		41st	1893–1894	Sauk County and Western Columbia County 1890 population: 44,629
William F. Conger	Rep.		42nd	1895–1896
William F. Conger	Rep.		43rd	1897–1898	Columbia and Sauk counties 1895 population: 63,787 1900 population: 64,127 1910 population: 63,998
William G. Bissell	Rep.		44th	1899–1900
William G. Bissell	Rep.		45th	1901–1902
George Wylie	Rep.		46th	1903–1904
George Wylie	Rep.		47th	1905–1906
Charles L. Pearson	Dem.		48th	1907–1908
Charles L. Pearson	Dem.		49th	1909–1910
John M. True	Rep.		50th	1911–1912
John M. True	Rep.		51st	1913–1914
George Staudenmayer	Dem.		52nd	1915–1916
	Dem.		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
Robert Caldwell	Rep.		59th	1929–1930
Fred W. Zantow	Rep.		60th	1931–1932
Fred W. Zantow	Rep.		61st	1933–1934
E. Myrwyn Rowlands	Prog.		62nd	1935–1936
E. Myrwyn Rowlands	Prog.		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--			77th	1965–1966
Walter Terry	Rep.		78th	1967–1968
Walter Terry	Rep.		79th	1969–1970
Everett Bidwell	Rep.		80th	1971–1972
			81st	1973–1974	Columbia, Marquette, and Sauk counties and Southern Adams County Western Dodge County Southern Juneau County Part 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 County Most of Richland County Northwest Dane County Western Dodge County
			87th	1985–1986	Columbia County and Western Dane County Part of Dodge County Part of Green County Part of Rock County Part of Sauk County
			88th	1987–1988
			89th	1989–1990
			90th	1991–1992
--Vacant--			91st	1993–1994	Green County and Western Dane County Western Rock County
Joe Wineke	Dem.	Won 1993 special election.	91st	1993–1994
			92nd	1995–1996
			93rd	1997–1998
Jon Erpenbach	Dem.		94th	1999–2000
			95th	2001–2002
			96th	2003–2004	Green County and Western Dane County Part of Lafayette County Part of Rock County
			97th	2005–2006
			98th	2007–2008
			99th	2009–2010
			100th	2011–2012
			101st	2013–2014	Western Dane County Most of Sauk County Eastern Iowa County Part of Columbia County Part 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 County eastern Iowa County parts of Columbia County northwest Green County