Ammon leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 85% of adults in Ammon typically vote, above the U.S. average of about 62%. Among adults in Ammon, ~22% vote Democratic, ~63% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How Ammon compares
Among cities within 25 miles, Ammon leans more Republican than 2 of 27 neighbors.
Ammon runs about 11 points more Republican than Idaho as a whole.
Politics vary noticeably by neighborhood within Ammon. The southeast side is the most Republican-leaning (R+57) and the west side is the least Republican-leaning (R+36), a spread of about 21 points.
Why Ammon 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 Ammon, not a ranked or complete list of what matters most.
Ammon votes Republican even though it is densely developed (about 67%, far above the Idaho average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 75% of households in Ammon are family households, above 75% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Ammon, ID sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Ammon looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Ammon 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 72%, about 12 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Ammon have completed high school, above 83% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Milo, ID R+62
- Idaho Falls, ID R+40
- Iona, ID R+64
- Beachs Corner, ID R+66
- Grant, ID R+65
- Garfield, ID R+65
- Osgood, ID R+70
- Ucon, ID R+66
- Woodville, ID R+61
- Shelley, ID R+64
Cities with Similar Populations
- Manchester, MO D+10
- Andrews, TX R+62
- Phelan, CA R+39
- Pinewood, FL D+58
- Murphy, NC R+50
- Greenfield, MA D+26
- Angier, NC R+29
- Knik-Fairview, AK R+40
- Benton Harbor, MI D+42
- Belle Glade, FL D+41
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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.