Trinity County leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 66% of adults in Trinity County typically vote, near the U.S. average of about 62%. Among adults in Trinity County, ~28% vote Democratic, ~38% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Trinity County compares
Trinity County runs about 34 points more Republican than California as a whole. California leans Democratic overall, while Trinity County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Trinity County. The southeast side is the most Republican-leaning (R+31) and the south side is the least Republican-leaning (R+5), a spread of about 27 points.
Why Trinity 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 Trinity County, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 7% of residents in Trinity County live in densely developed areas, about 51 points below the California average of 58%. Trinity County runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Trinity County, CA 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 Trinity County looks the way it does
Turnout in Trinity County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Shasta County, CA R+30
- Humboldt County, CA D+27
- Tehama County, CA R+35
- Siskiyou County, CA R+17
- Glenn County, CA R+32
- Mendocino County, CA D+23
- Del Norte County, CA R+15
- Butte County, CA R+3
- Colusa County, CA R+20
- Lake County, CA R+4
Counties with Similar Populations
- Crawford County, WI R+26
- Appomattox County, VA R+44
- Union County, FL R+61
- Radford City, VA Even
- Parke County, IN R+59
- Long County, GA R+26
- Wayne County, IL R+65
- Bates County, MO R+60
- Rockcastle County, KY R+70
- Kanabec County, MN R+44
Sources and methodology
Precinct-level voting records used to fit the model come from California 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.