Staggered Senate
Senators serve four-year terms; half the seats are on the ballot each election.
Montana › Montana State Senate · November 3, 2026 · Updated Oct 16, 2026
Montana State Senate District 48
Andrea Olsen has no major-party opponent.
Andrea Olsen has no major-party opponent.
How this race is decided
The candidates
DemocraticIncumbent
Andrea Olsen
Incumbent senator
- Experience
- State legislature
The district
Lean D+43: how much more Democratic or Republican than the nation it votes for president.
Presidential vote
Precinct results re-aggregated to the current district lines.
Who lives here
- Population
- 19,630
- People per km²
- 127
- Adults with a B.A.+
- 54%
- White, no degree
- 42%of adults
- White 87%
- Hispanic 2%
- Black 1%
- Asian 3%
- Other / multiracial 7%
American Community Survey 2020–2024, aggregated from census tracts.
Past results
Results in the same-numbered district; earlier elections may have used different lines.
2024 President Vote in this district
12,576 two-party votes · D+42.1 · D+43.6 vs. the nation✓ Kamala Harris (D)71.0%
Donald Trump (R)29.0%
2022 Earlier district lines
9,908 votes · D+27.8✓ Shane A Morigeau (D)63.9%
Jacob van Horn (R)36.1%
2020 President Vote in this district
12,634 two-party votes · D+45.7 · D+41.2 vs. the nation✓ Joe Biden (D)72.9%
Donald Trump (R)27.1%
2018 Earlier district lines
10,240 votes · D+25.5✓ Nate McConnell (D)62.8%
Adam S Pummill (R)37.2%
2016 President Vote in this district
10,440 two-party votes · D+39.2 · D+37.0 vs. the nation✓ Hillary Clinton (D)69.6%
Donald Trump (R)30.4%
2014 Earlier district lines
6,118 votes · D+15.3✓ Cynthia Wolken (D)57.7%
Mike Hopkins (R)42.3%