Lassen County leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 57% of adults in Lassen County typically vote, near the U.S. average of about 62%. Among adults in Lassen County, ~18% vote Democratic, ~39% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How Lassen County compares
Lassen County runs about 57 points more Republican than California as a whole. California leans Democratic overall, while Lassen County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Lassen County. The northeast side is the most Republican-leaning (R+56) and the east side is the least Republican-leaning (R+24), a spread of about 31 points.
Why Lassen 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 Lassen County, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 13% of adults in Lassen County hold a bachelor's degree, about 22 points below the California average of 35%. A high family-household share predicts Republican voting, and about 71% of households in Lassen County are family households, above 85% of counties. Lassen County runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion and voter turnout
Places with low high-school-completion share tend to turn out at a lower rate; Lassen County, CA sits in the bottom tenth nationally on this measure.
Why turnout in Lassen County looks the way it does
Areas with low high-school completion turn out at lower rates. About 77% of adults in Lassen County have completed high school, about 13 points below the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Plumas County, CA R+23
- Sierra County, CA R+19
- Washoe County, NV D+3
- Modoc County, CA R+44
- Butte County, CA R+3
- Nevada County, CA D+11
- Storey County, NV R+40
- Tehama County, CA R+35
- Shasta County, CA R+30
- Carson City, NV R+11
Counties with Similar Populations
- Jackson County, OH R+58
- Rhea County, TN R+63
- Logan County, WV R+66
- Weakley County, TN R+53
- Morgan County, IL R+25
- Jasper County, IN R+50
- Dorchester County, MD R+9
- Hale County, TX R+44
- Greenbrier County, WV R+47
- Jefferson County, WA D+45
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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.