2018 general · November 6, 2018
2018 Wisconsin State Senate election results, district by district
Every Wisconsin State Senate district in the 2018 general election: winners, margins, unopposed seats and seats that changed party.
Seats after the election
Republicans controlled the chamber · 33 seats
After the electionD 13 · R 20
Races17
Changed party0
Unopposed24%4 races
Incumbents defeated0
Every district
D 6 · R 11
| Race | Winner | Won by | Notes |
|---|---|---|---|
| SD-1 | André Jacque (R) | 9.1 | |
| SD-3 | Tim Carpenter (D) | Unopposed | |
| SD-5 | Dale Kooyenga (R) | 2.4 | |
| SD-7 | Chris Larson (D) | 32.8 | |
| SD-9 | Devin LeMahieu (R) | 17.0 | |
| SD-11 | Steve Nass (R) | Unopposed | |
| SD-13 | Scott Fitzgerald (R) | 18.2 | |
| SD-15 | Janis Ringhand (D) | Unopposed | |
| SD-17 | Howard Marklein (R) | 8.2 | |
| SD-19 | Roger J. Roth Jr. (R) | 6.5 | |
| SD-21 | Van Wanggaard (R) | 16.1 | |
| SD-23 | Kathy Bernier (R) | 18.3 | |
| SD-25 | Janet Bewley (D) | 2.1 | |
| SD-27 | Jon Erpenbach (D) | 32.4 | |
| SD-29 | Jerry J. Petrowski (R) | 28.5 | |
| SD-31 | Jeff Smith (D) | 5.7 | |
| SD-33 | Chris Kapenga (R) | Unopposed |
Wisconsin 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