Rossmoor is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.
About 85% of adults in Rossmoor typically vote, above the U.S. average of about 62%. Among adults in Rossmoor, ~42% vote Democratic, ~43% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How Rossmoor compares
Among cities within 25 miles, Rossmoor sits roughly in the middle of the political spectrum, with 16 neighbors leaning further in the place's direction and 109 leaning the other way.
Rossmoor runs about 19 points more Republican than California as a whole.
Why Rossmoor leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Rossmoor. The lean here lands roughly where demographic data alone would predict.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Rossmoor, CA sits in the top tenth nationally on this measure.
Why turnout in Rossmoor looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Rossmoor 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Rossmoor have completed high school, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Los Alamitos, CA Even
- Seal Beach, CA D+4
- Hawaiian Gardens, CA D+27
- Cypress, CA D+3
- Lakewood, CA D+17
- La Palma, CA D+4
- Sunset Beach, CA R+15
- Stanton, CA D+6
- Signal Hill, CA D+34
- Long Beach, CA D+40
Cities with Similar Populations
- Lake Hiawatha, NJ R+2
- East Greenbush, NY D+10
- Lancaster, KY R+56
- Jefferson, LA D+7
- Ruckersville, VA R+20
- New Baltimore, VA R+17
- River Grove, IL R+4
- Maynard, MA D+38
- Chillicothe, MO R+46
- Kenai, AK R+28
All Local Stats
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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.