Madison County leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 78% of adults in Madison County typically vote, above the U.S. average of about 62%. Among adults in Madison County, ~21% vote Democratic, ~57% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Madison County compares
Among counties within 50 miles, Madison County is the most Republican-leaning.
Madison County runs about 26 points more Republican than Montana as a whole.
Politics vary noticeably by city within Madison County. The north side is the most Republican-leaning (R+60) and the southeast side is the least Republican-leaning (R+24), a spread of about 36 points.
Why Madison County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Madison County, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. Madison County sits in the bottom quarter on density and about 90% of residents are non-Hispanic white, about 7 points above the Montana average of 83%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Madison County, MT sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Madison County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Madison County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 81% of households in Madison County own their home, above 85% of counties. High high-school completion lines up with higher turnout, and about 94% of adults in Madison County have completed high school, above 82% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Beaverhead County, MT R+42
- Gallatin County, MT D+6
- Silver Bow County, MT Even
- Jefferson County, MT R+38
- Broadwater County, MT R+54
- Park County, MT R+14
- Deer Lodge County, MT R+18
- Powell County, MT R+48
- Lewis and Clark County, MT R+7
- Clark County, ID R+65
Counties with Similar Populations
- Woods County, OK R+57
- Wilson County, KS R+59
- Dimmit County, TX R+4
- Lucas County, IA R+44
- Oregon County, MO R+69
- Montgomery County, GA R+47
- Platte County, WY R+65
- Lee County, AR D+10
- Wilkinson County, MS D+38
- Monroe County, MO R+57
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from Montana Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.