Iowa's 20th Senate district

Iowa's 20th State Senate district
Senator	Mike Pike R

The 20th District of the Iowa Senate is located in central Iowa, and is currently composed of part of Polk County.^[1]

Current elected officials

Mike Pike is the senator currently representing the 20th District.^[2]

The area of the 20th District contains two Iowa House of Representatives districts:^[3]

• The 39th District (represented by Rick L. Olson)
• The 40th District (represented by Bill Gustoff)

The district is also located in Iowa's 3rd congressional district, which is represented by Zach Nunn.^[4]

List of representatives

^[5]

Representative	Party		Dates	Residence	Notes
Andrew Young Hull		Democrat	1852-1853	Polk County, Iowa
Theophilus Bryan		Democrat	1854-1856	Guthrie County, Iowa	Senator Bryan died in office in 1856
James Cunningham Jordan		Whig	1854-1855	Polk County, Iowa
Samuel Jordan Kirkwood		Republican	1856-1859	Iowa City, Iowa
George M. Davis		Republican	1860-1861	Lyons, Iowa
Norman Boardman		Republican	1862-1863	Lyons, Iowa
Philo Gould Camp Merrill		Republican	1864-1865	Grinnell, Iowa
William McMarshman		Republican	1866-1867	Warren County, Iowa
George E. Griffith		Republican	1868-1871	Indianola, Iowa
Mark Antony Dashiell		Republican	1872-1875	Hartford, Iowa
William Graham		Republican	1876-1877	Indianola, Iowa
Thomas Hanna		Republican	1878-1881	Muscatine, Iowa
Pliny Nichols		Republican	1882-1885	Muscatine County, Iowa
Samuel Tyler Chesebro		Democrat	1886-1889	Muscatine County, Iowa
John M. Gobble		Democrat	1890-1893	Muscatine, Iowa
Charles Albert Carpenter		Republican	1894-1897	Columbus Junction, Iowa
George Marion Titus		Republican	1898-1901	Muscatine, Iowa
Fred M. Molsberry		Republican	1902-1906	Columbus Junction, Iowa
Jay Ira Nichols		Republican	1907-1910	West Liberty, Iowa
Alexander Middleton Garrett		Democrat	1911-1914	Louisa County, Iowa
Frederick William Eversmeyer		Republican	1915-1918	Muscatine, Iowa
Jonas DeMoss Buser		Republican	1919-1926	Muscatine County, Iowa
Samuel Franklin Wilson		Republican	1927	Morning Sun, Iowa	Senator Wilson died before assuming office in 1927.
Edwin Hicklin		Republican	1931-1934	Wapello, Iowa
Elmer Primer Corwin		Republican	1935-1942	Muscatine County, Iowa
Floyd J. Pine		Republican	1943-1946	Louisa County, Iowa
Herman B. Lord		Republican	1947-1954	Muscatine, Iowa
George W. Weber		Republican	1955-1962	Columbus Junction, Iowa
John M. Ely		Democratic	1963-1964	Cedar Rapids, Iowa
Tom Riley		Republican	1965-1966	Cedar Rapids, Iowa
William F. Denman		Democratic	1967-1970	Des Moines, Iowa	In 1964, after previous amendments to the Iowa Constitution were determined to violate the 14th Amendment, an interim plan increased the number of senators and representatives in the state by apportioning additional senators and representatives to the most populous districts/counties. This plan existed from 1965 to 1970, when a new districting and apportionment plan was adopted.[6]
Lee H. Guadineer		Democratic	1967-1970	Des Moines, Iowa
George E. O'Malley		Democratic	1967-1970	Des Moines, Iowa
William J. Reichardt		Democratic	1967-1970	Des Moines, Iowa
Howard C. Reppert		Democratic	1967-1970	Des Moines, Iowa
Willa Charlene Conklin		Republican	1971-1972	Waterloo, Iowa
Elizabeth Ruby Miller		Republican	1973-1980	Marshall County, Iowa
Michael R. Lura		Republican	1981-1982	Marshall County, Iowa
Edgar H. Holden		Republican	1983-1988	Scott County, Iowa
Maggie Tinsman		Republican	1989-1992	Scott County, Iowa
Jack Rife		Republican	1993-2000	Cedar County, Iowa
Thomas L. Fiegen		Democratic	2001-2002	Clarence, Iowa
John Putney		Republican	2003-2008	Gladbrook, Iowa
Tim L. Kapucian		Republican	2009-2012	Keystone, Iowa
Brad Zaun		Republican	2013-2022	Urbandale, Iowa
Nate Boulton		Democratic	2023-2024	Des Moines, Iowa
Mike Pike		Republican	2025-Present	Des Moines, Iowa

Historical district boundaries

^[7]

Map	Description	Years effective	Notes
	Boone County Bancroft County Calhoun County (named Fox County at the time) Cerro Gordo County Dallas County Emmet County Franklin County Greene County Guthrie County Hancock County Hamilton County (named Risley County at the time) Hardin County Humboldt County Jasper County Kossuth County Marshall County Palo Alto County Pocahontas County Polk County Story County Webster County (named Yell County at the time) Winnebago County Worth County Wright County	1852-1855	From 1846 to 1857, district numbering was not utilized by the Iowa State Legislature. This convention was added with the passing of the 1857 Iowa Constitution. Numbering of districts pre-1857 is done as a matter of historic convenience.[8]
	Iowa County Johnson County	1856-1859
	Clinton County	1860-1863
	Warren County	1864-1877
	Muscatine County	1878-1887
	Louisa County Muscatine County	1888-1962
	Linn County	1963-1966
	Polk County	1967-1970
	Black Hawk County (partial)	1971-1972
	Grundy County (partial) Hardin County (partial) Jasper County (partial) Marshall County (partial) Story County (partial)	1973-1982
	Scott County (partial)	1983-1992
	Cedar County Clinton County (partial) Jones County (partial) Scott County (partial)	1993-2002
	Benton County Grundy County Iowa County (partial) Honey Creek Township Marengo Township Washington Township Marengo Tama County Excluding Columbia Township Richland Township Salt Creek Township Chelsea	2003-2012
	Polk County (partial) Jefferson Township Grimes Johnston Urbandale	2013-2022
	Polk County (partial) Altoona Des Moines (partial) North East part of the city Pleasant Hill	2023-Present

See also

• Iowa General Assembly
• Iowa Senate

References

1. "SENATE DISTRICT 20" (PDF). Iowa General Assembly. Retrieved March 28, 2024.
2. Agency, Iowa Legislative Services. "Iowa Legislature - Legislator List". Retrieved April 14, 2025.
3. "Iowa House Districts" (PDF). Iowa Legislative Services Agency. Retrieved July 15, 2016.
4. "Iowa Congressional Districts" (PDF). Iowa Legislative Services Agency. Retrieved July 15, 2016.
5. "Historic Legislator List SD 16".
6. "Red Book of the 62nd GA" (PDF).
7. "Iowa historic district map database".
8. "1846 Iowa Constitution" (PDF).