2022Final results
2022 election for Montana Senate District 42
Montana State Senate · Montana
Mary Ann Dunwell (D) won with 55.3% of the vote, defeating Matt Olson (R) by 10.6 points.
Mary Ann DunwellDemocrat · winner
55.3%5,071
Matt OlsonRepublican
44.7%4,103
9,174 votes
Source: MIT Election Data and Science LabUpdated Oct 2, 2026, 5:14 AM ET
The seat over time
D − R margin in this seat's races around 2022
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 2, 2026, 5:14 AM ET