Topzle Updated: Wikipedia source
The 1st district of the Iowa Senate, located in Northwestern Iowa, is currently composed of part of Woodbury County. It is represented by Catelin Drey, who won an August 2025 special election to succeed Republican Rocky De Witt. On September 15, 2025, she was sworn in by Iowa Supreme Court Justice Matthew McDermott.
| Representative | Party | Dates | Residence | Notes | |
| Jacob Huner | Democratic | 1846-1848 | Fort Madison | ||
| James Sprott | Whig | 1846-1850 | Summittville | ||
| Thomas Stevenson Espy | Democratic | 1848-1852 | Fort Madison | ||
| Nathan Baker | Democratic | 1850-1852 | West Point | ||
| James M. Love | Democratic | 1852-1855 | Keokuk | ||
| Calvin J. Price | Democratic | 1852-1854 | |||
| David Trowbridge Brigham | Democratic | 1854-1856 | |||
| Salmon Cowles | Democratic | 1852-1854 | Fort Madison | ||
| Exum S. McCulloch | Democratic | 1854-1858 | Harrison Township | ||
| William A. Thurston | Democratic | 1854-1858 | Fort Madison | ||
| John R. Allen | Democratic | 1858-1860 | |||
| John Walker Rankin | Republican | 1858-1862 | Keokuk | ||
| Valentine Buechel | Democratic | 1860-1862 | Fort Madison | ||
| Frederick Hesser | Democratic | 1862-1866 | Fort Madison | ||
| George Washington McCrary | Republican | 1862-1866 | Keokuk | ||
| Nathaniel Gates Hedges | Democratic | 1866-1870 | |||
| Joseph Hollman | Democratic | 1866-1870 | |||
| Exum S. McCulloch | Democratic | 1870-1874 | Harrison Township | ||
| Henry Rothert | Republican | 1874-1878 | Keokuk | ||
| James Shelley | Democratic | 1878-1882 | Keokuk | ||
| Henry Rothert | Republican | 1882-1886 | Keokuk | ||
| Josephy M. Casey | Democratic | 1886-1888 | Fort Madison | ||
| William Kent | Democratic | 1888-1894 | Fort Madison | ||
| John Downey | Democratic | 1894-1898 | Lee County | ||
| David Young | Democratic | 1898-1907 | Keokuk | ||
| E. P. McManus | Democratic | 1907-1915 | Keokuk | ||
| Joseph R. Frailey | Republican | 1915-1923 | Fort Madison | ||
| Isaac Snook | Democratic | 1923-1927 | West Point | ||
| Joseph R. Frailey | Republican | 1927-1935 | Fort Madison | ||
| Timothy Driscoll | Democratic | 1935-1937 | Belfast | ||
| Stanley Hart | Republican | 1937-1955 | Keokuk | ||
| Edward McManus | Democratic | 1955-1959 | Keokuk | ||
| Charles Eppers | Democratic | 1959-1963 | Keokuk | ||
| Seeley Lodwick | Republican | 1963-1969 | Wever | ||
| Wilson Davis | Republican | 1969-1971 | Keokuk | ||
| Lucas DeKoster | Republican | 1971-1983 | Hull | ||
| Milo Colton | Democratic | 1983-1987 | Sioux City | ||
| Al Sturgeon | Democratic | 1987-1995 | Sioux City | ||
| Steven Hansen | Democratic | 1995-2003 | Sioux City | ||
| Steven Warnstadt | Democratic | 2003-2011 | Sioux City | ||
| Rick Bertrand | Republican | 2011-2013 | Sioux City | ||
| David Johnson | Republican | 2013-2015 | Ocheyedan | ||
| David Johnson | Independent | 2015-2019 | Ocheyedan | ||
| Zach Whiting | Republican | 2019-2021 | Spirit Lake | ||
| Dave Rowley | Republican | 2021-2023 | |||
| Rocky De Witt | Republican | 2023-2025 | |||
| Catelin Drey | Democratic | 2025-present | Sioux City | ||
| Party | Candidate | Votes | % | |
| Republican | Zach Whiting | 3,539 | 62.4 | |
| Republican | Brad D. Price | 1,288 | 22.7 | |
| Republican | Jesse Wolfe | 844 | 14.9 | |
| Total votes | 5,671 | 100.0 | ||
| Party | Candidate | Votes | % | |
| Republican | Zach Whiting | 21,245 | 100.0 | |
| Total votes | 21,245 | 100.0 | ||
| Republican gain from Independent | ||||
| Map | Description | Years effective | Notes |
| Lee County | 1846 - 1857 | 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. | |
| Lee County | 1858-1970 | ||
| Plymouth County Sioux County Lyon County (part) | 1971-1972 | In 1970, the Iowa Legislature passed an amendment to the Iowa Constitution setting forth the rules for legislative redistricting in order to abide by the rules established by the Reynolds v. Sims Supreme Court case. The first reapportionment map created by the Republican controlled legislature was deemed unconstitutional, but was still used for the 1970 election. | |
| Plymouth County (part) Sioux County (part) Lyon County (part) | 1973-1982 | ||
| Woodbury County (part) | 1983-1992 | ||
| Woodbury County (part) | 1993-2002 | ||
| | Woodbury County (part) Sioux City (North Half) | 2003-2012 | |
| | Lyon County Osceola County Dickinson County Clay County Palo Alto County | 2013-2022 | |
| | Woodbury County (part) Sioux City (North Half) Concord Township Banner Township Lawton | 2023–present |