San Buenaventura leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 69% of adults in San Buenaventura typically vote, above the U.S. average of about 62%. Among adults in San Buenaventura, ~40% vote Democratic, ~29% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How San Buenaventura compares
Among cities within 25 miles, San Buenaventura leans more Democratic than 14 of 24 neighbors.
San Buenaventura runs about 5 points more Republican than California as a whole.
Politics vary noticeably by neighborhood within San Buenaventura. The north side is the most Democratic-leaning (D+17) and the southwest side is the least Democratic-leaning (D+3), a spread of about 14 points.
Why San Buenaventura 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 San Buenaventura, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 57% of residents in San Buenaventura live in densely developed areas, about 20 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and San Buenaventura sits in the top quarter (about 38%, above 85% of cities). A high never-married share predicts Democratic voting, and about 48% of adults in San Buenaventura have never been married, above 98% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; San Buenaventura, CA sits in the top quarter nationally on this measure.
Why turnout in San Buenaventura looks the way it does
Areas with limited routine healthcare access turn out at lower rates. San Buenaventura is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Ventura, CA D+22
- Oak View, CA D+13
- Mira Monte, CA D+22
- Meiners Oaks, CA D+3
- Ojai, CA D+33
- Oxnard, CA D+16
- Port Hueneme Cbc Base, CA R+3
- Port Hueneme, CA D+22
- Sulphur Springs, CA D+14
- Santa Paula, CA D+21
Cities with Similar Populations
- Lacey, KY R+67
- Bynum, MT R+59
- Oakridge, MN R+36
- Saturn, TX R+64
- Thane, AK D+37
- Telegraph, TX R+75
- Gray, NY R+52
- Sprankle Mills, PA R+70
- Limestone, MI R+26
- Midkiff, WV R+69
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.