# Iowa's 20th Senate district

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

## Current elected officials

Nate Boulton is the senator currently representing the 20th District.
The area of the 20th District contains two Iowa House of Representatives districts:
* 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.

## List of representatives

| 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. |
| 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 | Republican | 2023-Present | Des Moines, Iowa | |

## Historical district boundaries

| 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. |
| 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 |