2020 general · November 3, 2020
2020 Iowa State Senate election results, district by district
Every Iowa State Senate district in the 2020 general election: winners, margins, unopposed seats and seats that changed party.
Seats after the election
Republicans controlled the chamber · 50 seats
After the electionD 18 · R 32
Races25
Changed party2
Unopposed20%5 races
Incumbents defeated1
Every district
D 6 · R 19
| Race | Winner | Won by | Notes |
|---|---|---|---|
| SD-2 | Jeff Taylor (R) | Unopposed | |
| SD-4 | Dennis Guth (R) | Unopposed | |
| SD-6 | Craig Williams (R) | 38.4 | |
| SD-8 | Dan Dawson (R) | 4.4 | |
| SD-10 | Jake Chapman (R) | 25.0 | |
| SD-12 | Mark Costello (R) | 38.2 | |
| SD-14 | Amy Sinclair (R) | Unopposed | |
| SD-16 | Nate Boulton (D) | 52.8 | |
| SD-18 | Janet Petersen (D) | Unopposed | |
| SD-20 | Brad Zaun (R) | 2.3 | |
| SD-22 | Sarah Garriott (D) | 0.4 | Flipped |
| SD-24 | Jesse Green (R) | 31.4 | |
| SD-26 | Waylon Brown (R) | 31.1 | |
| SD-28 | Mike Klimesh (R) | 24.9 | |
| SD-30 | Eric Giddens (D) | 3.0 | |
| SD-32 | Craig Johnson (R) | 22.3 | |
| SD-34 | Liz Mathis (D) | Unopposed | |
| SD-36 | Jeff Edler (R) | 21.1 | |
| SD-38 | Dawn Driscoll (R) | 28.0 | |
| SD-40 | Ken Rozenboom (R) | 43.0 | |
| SD-42 | Jeff Reichman (R) | 19.8 | FlippedIncumbent lost |
| SD-44 | Tim Goodwin (R) | 13.6 | |
| SD-46 | Mark Lofgren (R) | 18.7 | |
| SD-48 | Dan Zumbach (R) | 30.3 | |
| SD-50 | Pam Jochum (D) | 17.4 |
Iowa State Senate
Results are each source's final count; margins are the winner's lead over the runner-up in points of the vote. Source: MIT Election Data and Science Lab