San Juan County leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 60% of adults in San Juan County typically vote, near the U.S. average of about 62%. Among adults in San Juan County, ~24% vote Democratic, ~36% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How San Juan County compares
Politically, San Juan County sits close to the rest of Utah.
Politics vary noticeably by city within San Juan County. The southwest side runs the most Democratic (D+50) and the northeast side runs the most Republican (R+64), a spread of about 113 points.
Why San Juan 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 San Juan County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 74% of households in San Juan County are family households, about 8 points above the U.S. average of 67%. Rural areas vote Republican, and San Juan County sits in the bottom quarter on density (about 7%, below 88% of counties).
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; San Juan County, UT sits in the bottom quarter 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 San Juan County looks the way it does
Areas with high food insecurity turn out at lower rates. About 28% of adults in San Juan County report food insecurity, about 12 points above the U.S. average of 16%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Dolores County, CO R+45
- Montezuma County, CO R+24
- Grand County, UT R+2
- San Juan County, NM R+26
- San Miguel County, CO D+35
- La Plata County, CO D+13
- San Juan County, CO D+29
- Ouray County, CO D+13
- Montrose County, CO R+30
- Wayne County, UT R+64
Counties with Similar Populations
- Jefferson County, FL R+20
- Moultrie County, IL R+54
- Cannon County, TN R+69
- Carbon County, WY R+57
- Clay County, AR R+62
- Mills County, IA R+33
- Harrison County, OH R+56
- Las Animas County, CO R+13
- Fulton County, PA R+70
- Livingston County, MO R+52
Sources and methodology
Precinct-level voting records used to fit the model come from Utah Lieutenant Governor's Office, 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.