Glenn County leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 56% of adults in Glenn County typically vote, below the U.S. average of about 62%. Among adults in Glenn County, ~19% vote Democratic, ~37% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How Glenn County compares
Among counties within 50 miles, Glenn County leans more Republican than 3 of 4 neighbors.
Glenn County runs about 53 points more Republican than California as a whole. California leans Democratic overall, while Glenn County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Glenn County. The southeast side is the most Republican-leaning (R+65) and the north side is the least Republican-leaning (R+19), a spread of about 46 points.
Why Glenn 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 Glenn County, not a ranked or complete list of what matters most.
Glenn County votes against the grain of California. California leans Democratic overall, while Glenn County runs about 53 points more Republican. Dense places usually vote Democratic, but Glenn County runs against that pattern. Low college attainment predicts Republican voting, and Glenn County sits in the bottom quarter (about 15%, below 88% of counties).
Homeownership and voter turnout
Places with renter-heavy households tend to turn out at a lower rate; Glenn County, CA sits in the bottom tenth nationally on this measure.
Why turnout in Glenn County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Glenn County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 38% of households in Glenn County rent, above 92% of counties. Crowded housing lines up with lower turnout, and about 4% of homes in Glenn County have more than one occupant per room, above 90% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Butte County, CA R+3
- Tehama County, CA R+35
- Colusa County, CA R+20
- Sutter County, CA R+23
- Yuba County, CA R+16
- Lake County, CA R+4
- Shasta County, CA R+30
- Mendocino County, CA D+23
- Nevada County, CA D+11
- Plumas County, CA R+23
Counties with Similar Populations
- Alpena County, MI R+25
- Van Wert County, OH R+56
- Ellis County, KS R+38
- Fayette County, OH R+55
- Pine County, MN R+37
- Ripley County, IN R+59
- Marion County, TN R+62
- Garrett County, MD R+50
- Jasper County, SC Even
- Mason County, MI R+20
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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.