Franklin County is a Republican stronghold. About 12% of voters here vote Democratic and 88% Republican.
About 77% of adults in Franklin County typically vote, above the U.S. average of about 62%. Among adults in Franklin County, ~9% vote Democratic, ~68% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Franklin County compares
Among counties within 50 miles, Franklin County is the most Republican-leaning.
Franklin County runs about 40 points more Republican than Idaho as a whole.
Why Franklin 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 Franklin County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 82% of households in Franklin County are family households, about 15 points above the U.S. average of 67%. Rural areas vote Republican, and Franklin County sits in the bottom quarter on density (about 13%, below 77% of counties).
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Franklin County, ID sits below the national average 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 Franklin County looks the way it does
Areas with high high-school completion turn out at higher rates. About 95% of adults in Franklin County have completed high school, about 6 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Oneida County, ID R+76
- Cache County, UT R+32
- Bear Lake County, ID R+71
- Box Elder County, UT R+56
- Rich County, UT R+66
- Caribou County, ID R+73
- Bannock County, ID R+25
- Weber County, UT R+21
- Lincoln County, WY R+66
- Power County, ID R+46
Counties with Similar Populations
- Gulf County, FL R+56
- Cedar County, MO R+65
- Rusk County, WI R+38
- Choctaw County, OK R+54
- O'Brien County, IA R+54
- Smith County, MS R+59
- Claiborne Parish, LA R+11
- Massac County, IL R+46
- Estill County, KY R+63
- Clay County, AL R+65
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.