Gem County is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 82% of adults in Gem County typically vote, above the U.S. average of about 62%. Among adults in Gem County, ~17% vote Democratic, ~65% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Gem County compares
Among counties within 50 miles, Gem County leans more Republican than 6 of 7 neighbors.
Gem County runs about 22 points more Republican than Idaho as a whole.
Politics vary noticeably by city within Gem County. The southwest side is the most Republican-leaning (R+68) and the south side is the least Republican-leaning (R+52), a spread of about 16 points.
Why Gem 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 Gem County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 73% of households in Gem County are family households, about 6 points above the U.S. average of 67%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Gem County, ID sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Gem County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Gem 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 66%, about 6 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Canyon County, ID R+40
- Ada County, ID R+8
- Payette County, ID R+57
- Boise County, ID R+50
- Malheur County, OR R+42
- Washington County, ID R+57
- Owyhee County, ID R+63
- Valley County, ID R+41
- Adams County, ID R+57
- Elmore County, ID R+42
Counties with Similar Populations
- Pickens County, AL R+21
- McDowell County, WV R+56
- Beadle County, SD R+46
- Perry County, IN R+39
- Ashley County, AR R+46
- Roosevelt County, NM R+37
- Butler County, AL R+13
- Kent County, MD Even
- Polk County, AR R+63
- Green Lake County, WI R+34
All Local Stats
Home Services
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.