2018Flipped from DemocraticFinal results
2018 election for Iowa Senate District 15
Iowa State Senate · Iowa
Zach Nunn (R) won with 56.9% of the vote, defeating Dan Nieland (D) by 13.9 points, a seat Democrats won last time.
Zach NunnRepublican · winner
56.9%16,988
Dan NielandDemocrat
43.0%12,830
29,856 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET