Spring Valley leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 59% of adults in Spring Valley typically vote, near the U.S. average of about 62%. Among adults in Spring Valley, ~33% vote Democratic, ~26% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Spring Valley compares
Among cities within 25 miles, Spring Valley leans more Democratic than 18 of 31 neighbors.
Spring Valley runs about 9 points more Republican than California as a whole.
Politics vary noticeably by neighborhood within Spring Valley. The northwest side runs the most Democratic (D+25) and the southeast side runs the most Republican (Even), a spread of about 25 points.
Why Spring Valley 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 Spring Valley, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 92% of residents in Spring Valley live in densely developed areas, about 55 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Spring Valley sits in the top quarter (about 31%, above 76% of cities). A high never-married share predicts Democratic voting, and about 36% of adults in Spring Valley have never been married, above 89% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Spring Valley, CA sits in the top tenth nationally on this measure.
Why turnout in Spring Valley looks the way it does
Renters vote less often than owners. About 39% of households in Spring Valley rent, about 14 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 7% of homes in Spring Valley have more than one occupant per room, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Casa de Oro-Mount Helix, CA D+11
- La Presa, CA D+18
- Lemon Grove, CA D+22
- La Mesa, CA D+24
- Rancho San Diego, CA R+18
- El Cajon, CA R+11
- Bonita, CA D+8
- Bostonia, CA R+8
- National City, CA D+24
- Santee, CA R+9
Cities with Similar Populations
- Santa Paula, CA D+21
- Tifton, GA R+12
- Stevens Point, WI D+6
- Independence, KY R+31
- Bel Air North, MD R+13
- West Chicago, IL D+9
- Sonoma, CA D+48
- Orangevale, CA R+10
- Bixby, OK R+23
- Brooklyn Center, MN D+40
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.