Montana State Senate District 45

State Legislative District Profile (Upper Chamber)

Overview

District ID
mt-sd-045
State
Montana
Chamber
Upper chamber (state senate)
District Code
045
Land Area
2,124.6 sq mi
Water Area
8.07 sq mi

Boundary

Boundary of Montana State Senate District 45

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Mineral County1219.62 sq mi57.4%100.0%
Missoula County726.55 sq mi34.2%28.0%
Sanders County178.47 sq mi8.4%6.5%

Showing all 3 counties

Places

PlaceOverlapShare of district landShare of place land
Lolo CDP9.46 sq mi0.4%100.0%
Frenchtown CDP6.74 sq mi0.3%100.0%
Riverbend CDP3.94 sq mi0.2%100.0%
De Borgia CDP2.74 sq mi0.1%100.0%
Cyr CDP1.40 sq mi0.1%100.0%
Missoula city1.35 sq mi0.1%3.9%
Superior town0.95 sq mi<0.1%100.0%
St. Regis CDP0.86 sq mi<0.1%100.0%
Huson CDP0.77 sq mi<0.1%100.0%
Haugan CDP0.64 sq mi<0.1%100.0%
Alberton town0.55 sq mi<0.1%100.0%
Saltese CDP0.33 sq mi<0.1%99.9%
Paradise CDP0.25 sq mi<0.1%99.9%

Showing all 13 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
MT District 121,677100.0%4.0%100.0%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
16,542
Active Voters
14,421 (87.2%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202413,536 (81.8%)0 (0.0%)0 (0.0%)
2021–202212,439 (75.2%)0 (0.0%)0 (0.0%)
2019–202012,470 (75.4%)0 (0.0%)0 (0.0%)
2017–201810,276 (62.1%)0 (0.0%)0 (0.0%)
2015–20169,320 (56.3%)0 (0.0%)0 (0.0%)
2013–20147,298 (44.1%)0 (0.0%)0 (0.0%)
2011–20127,608 (46.0%)0 (0.0%)0 (0.0%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 09/10/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
22,888 (± 1,694)
Median Age
40.9
Median Household Income
$83,326 (± $6,511)
High School Graduate or Higher (age 25+)
94.4%
Bachelor's Degree or Higher (age 25+)
35.3%

Population by Age

GroupPeopleShare
Under 185,45323.8%
18 to 6412,56354.9%
65 and over4,87221.3%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)9764.3%
White, not Hispanic20,35588.9%
Black, not Hispanic1460.6%
Asian, not Hispanic2511.1%
American Indian / Alaska Native, not Hispanic950.4%
Native Hawaiian / Pacific Islander, not Hispanic270.1%
Some other race, not Hispanic450.2%
Two or more races, not Hispanic9934.3%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
22,863
Citizen Voting Age Population (CVAP)
17,408

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic21,89295.8%
Hispanic9694.2%
White20,50589.7%
Black1460.6%
Asian2511.1%
American Indian / Alaska Native890.4%
Native Hawaiian / Pacific Islander510.2%
Two or More Races550.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic16,91897.2%
Hispanic4892.8%
White15,87891.2%
Black980.6%
Asian4142.4%
American Indian / Alaska Native4842.8%
Native Hawaiian / Pacific Islander60.0%
Two or More Races400.2%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).