Jamul leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 61% of adults in Jamul typically vote, near the U.S. average of about 62%. Among adults in Jamul, ~20% vote Democratic, ~41% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Jamul compares
Among cities within 25 miles, Jamul leans more Republican than 32 of 35 neighbors.
Jamul runs about 55 points more Republican than California as a whole. California leans Democratic overall, while Jamul is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Jamul. The northeast side is the most Republican-leaning (R+44) and the southwest side is the least Republican-leaning (R+27), a spread of about 17 points.
Why Jamul 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 Jamul, not a ranked or complete list of what matters most.
Jamul votes against the grain of California. California leans Democratic overall, while Jamul runs about 55 points more Republican. A high family-household share predicts Republican voting, and about 82% of households in Jamul are family households, above 94% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Jamul, CA sits in the top quarter 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 Jamul looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Jamul is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 69%, about 9 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Rancho San Diego, CA R+18
- Alpine Heights, CA R+44
- El Cajon, CA R+11
- Casa de Oro-Mount Helix, CA D+11
- Spring Valley, CA D+11
- Dulzura, CA R+29
- Bostonia, CA R+8
- La Presa, CA D+18
- Lakeside, CA R+23
- Alpine, CA R+30
Cities with Similar Populations
- West Branch, MI R+37
- Bayport, NY R+19
- Waterville, OH R+16
- Grover, MO R+10
- Rittman, OH R+41
- Ottawa, OH R+60
- Oakland, MD R+46
- Somerdale, NJ D+17
- Westville, IN R+22
- South Lockport, NY R+15
All Local Stats
Home Services
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.