2020Final results
2020 election for Iowa Senate District 40
Iowa State Senate · Iowa
Ken Rozenboom (R) won with 71.5% of the vote, defeating Lance Roorda (D) by 43.0 points.
Ken RozenboomRepublican · winner · incumbent
71.5%22,022
Lance RoordaDemocrat
28.4%8,760
30,818 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET