92399 leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 67% of adults in 92399 typically vote, near the U.S. average of about 62%. Among adults in 92399, ~23% vote Democratic, ~44% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 92399 compares
Among zip codes within 15 miles, 92399 leans more Republican than 19 of 20 neighbors.
92399 runs about 50 points more Republican than California as a whole. California leans Democratic overall, while 92399 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 92399. The northeast side is the most Republican-leaning (R+38) and the west side is the least Republican-leaning (R+26), a spread of about 12 points.
Why 92399 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 92399, not a ranked or complete list of what matters most.
92399 votes against the grain of California. California leans Democratic overall, while 92399 runs about 50 points more Republican. Dense places usually vote Democratic, but 92399 runs against that pattern. A high family-household share predicts Republican voting, and about 75% of households in 92399 are family households, above 81% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 92399, CA sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 92399 looks the way it does
Turnout in 92399 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.