Swan Valley is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 63% of adults in Swan Valley typically vote, near the U.S. average of about 62%. Among adults in Swan Valley, ~12% vote Democratic, ~51% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How Swan Valley compares
Among cities within 25 miles, Swan Valley leans more Republican than 5 of 8 neighbors.
Swan Valley runs about 26 points more Republican than Idaho as a whole.
Why Swan Valley 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 Swan Valley, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 1% of residents in Swan Valley live in densely developed areas, about 17 points below the Idaho average of 18%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Swan Valley, ID 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 Swan Valley looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Swan Valley 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Swan Valley have completed high school, above 94% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Irwin, ID R+62
- Vernon, ID R+31
- Victor, ID R+16
- Bates, ID R+34
- Driggs, ID R+18
- Wilson, WY D+12
- Ririe, ID R+71
- Alpine, WY R+53
- Garfield, ID R+65
Cities with Similar Populations
- West Newton, MN R+29
- Franklin, IA R+45
- Troxel, IL R+32
- Preble, IN R+63
- Red Hill, OK R+71
- Bejou, MN R+26
- Havana, KS R+76
- Vandemere, NC D+11
- Dallardsville, TX R+58
- Taylors Valley, VA R+60
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Sources and methodology
Precinct-level voting records used to fit the model come from Idaho 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.