Oroville leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 54% of adults in Oroville typically vote, below the U.S. average of about 62%. Among adults in Oroville, ~22% vote Democratic, ~32% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How Oroville compares
Among cities within 25 miles, Oroville leans more Republican than 10 of 41 neighbors.
Oroville runs about 41 points more Republican than California as a whole. California leans Democratic overall, while Oroville is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Oroville. The southeast side is the most Republican-leaning (R+33) and the west side is the least Republican-leaning (R+8), a spread of about 26 points.
Why Oroville leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Oroville, not a ranked or complete list of what matters most.
Oroville votes Republican even though it is densely developed (about 57%, about 21 points above the U.S. average of 36%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Oroville runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Oroville, CA sits below the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Oroville looks the way it does
Renters vote less often than owners. About 39% of households in Oroville rent, about 14 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 21% of adults in Oroville report food insecurity, above 84% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- South Oroville, CA R+13
- Oroville East, CA R+29
- Thermalito, CA R+25
- Honcut, CA R+41
- Oregon City, CA R+41
- Palermo, CA R+34
- Pentz, CA R+36
- Butte Valley, CA R+25
- Berry Creek, CA R+30
- Bangor, CA R+35
Cities with Similar Populations
- Fountain Inn, SC R+30
- Union Hill-Novelty Hill, WA D+33
- Acton, MA D+43
- Seaford, DE R+10
- Summit, NJ D+29
- Central Falls, RI D+23
- Gretna, LA D+20
- Montclair, VA D+27
- Canfield, OH R+22
- Red Lion, PA R+28
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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.