2016Final results
2016 election for Iowa Senate District 48
Iowa State Senate · Iowa
Dan Zumbach (R) won with 62.9% of the vote, defeating Scott Peterson (D) by 29.7 points.
Dan ZumbachRepublican · winner · incumbent
62.9%20,065
Scott PetersonDemocrat
33.2%10,596
Brian W. CookLibertarian
3.9%1,232
31,905 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 4:52 AM ET
The seat over time
D − R margin in this seat's races around 2016
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 4:52 AM ET