Sheridan County is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 61% of adults in Sheridan County typically vote, near the U.S. average of about 62%. Among adults in Sheridan County, ~13% vote Democratic, ~48% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Sheridan County compares
Sheridan County runs about 38 points more Republican than Montana as a whole.
Why Sheridan 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 Sheridan County, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in Sheridan County live in densely developed areas, about 10 points below the Montana average of 13%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Sheridan 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 Sheridan County looks the way it does
Turnout in Sheridan County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Daniels County, MT R+66
- Roosevelt County, MT Even
- Divide County, ND R+59
- Williams County, ND R+61
- Richland County, MT R+62
- McKenzie County, ND R+56
- Burke County, ND R+76
- McCone County, MT R+72
- Valley County, MT R+48
- Mountrail County, ND R+35
Counties with Similar Populations
- Mercer County, MO R+70
- Lewis County, ID R+60
- Hardeman County, TX R+60
- Smith County, KS R+72
- Baca County, CO R+69
- Osborne County, KS R+74
- Costilla County, CO D+19
- Catron County, NM R+36
- Baylor County, TX R+66
- Hanson County, SD R+72
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.