Mount Vernon leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 31% of adults in Mount Vernon typically vote, below the U.S. average of about 62%. Among adults in Mount Vernon, ~21% vote Democratic, ~10% Republican, and ~69% don't vote. The map below shows estimated turnout by block group.
How Mount Vernon compares
Among neighborhoods within 5 miles, Mount Vernon leans more Democratic than 37 of 38 neighbors.
Mount Vernon runs about 17 points more Democratic than California as a whole.
Why Mount Vernon leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Mount Vernon, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Mount Vernon live in densely developed areas, about 64 points above the U.S. average of 36%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Mount Vernon, San Bernardino, CA sits in the bottom tenth nationally 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 Mount Vernon looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Mount Vernon is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 40%, about 22 points below the California average of 62%. High food insecurity lines up with lower turnout, and about 42% of adults in Mount Vernon report food insecurity, above 95% of neighborhoods. Low high-school completion lines up with lower turnout, and about 64% of adults in Mount Vernon have completed high school, below 97% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Shirrells, San Bernardino, CA D+53
- Alessandro, San Bernardino, CA D+29
- Muscupiabe, San Bernardino, CA D+20
- La Plaza, San Bernardino, CA D+27
- Delman, San Bernardino, CA D+25
- SBHS, San Bernardino, CA D+27
- Feldheym, San Bernardino, CA D+25
- Arrowview, San Bernardino, CA D+15
- DMV, San Bernardino, CA D+27
- Sandin Hills, San Bernardino, CA D+15
Neighborhoods with Similar Populations
- Echo Highlands, Birmingham, AL D+77
- Brooklands Park, Rochester Hills, MI R+4
- Duveneck-Saint Francis, Palo Alto, CA D+44
- White Grove, Fort Mill, SC R+20
- Millbrooke Ranch, Pinellas Park, FL R+11
- Riverside Heights, Tampa, FL D+21
- Accent, Des Moines, IA D+9
- Granville, Prescott Valley, AZ R+18
- Highlands Douglass, Louisville, KY D+57
- Germantown, Nashville, TN D+36
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.