Decker is a true toss-up. About 51% of voters here vote Democratic and 49% Republican.
About 38% of adults in Decker typically vote, below the U.S. average of about 62%. Among adults in Decker, ~19% vote Democratic, ~19% Republican, and ~62% don't vote. The map below shows estimated turnout by block group.
How Decker compares
Among cities within 25 miles, Decker sits roughly in the middle of the political spectrum, with 4 neighbors leaning further in the place's direction and 1 leaning the other way.
Decker runs about 22 points more Democratic than Montana as a whole. Montana leans Republican overall, while Decker sits closer to the political middle.
Politics vary noticeably by neighborhood within Decker. The east side runs the most Democratic (D+8) and the northeast side runs the most Republican (R+19), a spread of about 27 points.
Why Decker leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Decker, not a ranked or complete list of what matters most.
Decker votes against the grain of Montana. Montana leans Republican overall, while Decker runs about 22 points more Democratic.
Homeownership and voter turnout
Places with renter-heavy households tend to turn out at a lower rate; Decker, MT sits in the bottom tenth nationally on this measure.
Why turnout in Decker looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Decker is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 45%, about 17 points below the Montana average of 62%. Renters vote less often than owners, and about 45% of households in Decker rent, about 20 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 31% of adults in Decker report food insecurity, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Wyarno, WY R+72
- Kirby, MT D+7
- Birney, MT R+8
- Ranchester, WY R+67
- Sheridan, WY R+43
- Birney Day School, MT D+14
- Parkman, WY R+62
- Dayton, WY R+61
- Big Horn, WY R+56
- Wolf, WY R+62
Cities with Similar Populations
- Young Hickory, OH R+62
- Bairoil, WY R+64
- Wilroads Gardens, KS R+32
- Pinckneyville, MS D+45
- Westminster, PA R+22
- Westover, TN R+38
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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.