Aliso Viejo leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 69% of adults in Aliso Viejo typically vote, above the U.S. average of about 62%. Among adults in Aliso Viejo, ~38% vote Democratic, ~31% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Aliso Viejo compares
Among cities within 25 miles, Aliso Viejo leans more Democratic than 44 of 51 neighbors.
Aliso Viejo runs about 9 points more Republican than California as a whole.
Politics vary noticeably by neighborhood within Aliso Viejo. The north side is the most Democratic-leaning (D+18) and the west side is the least Democratic-leaning (D+6), a spread of about 12 points.
Why Aliso Viejo 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 Aliso Viejo, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 93% of residents in Aliso Viejo live in densely developed areas, about 57 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Aliso Viejo sits in the top quarter (about 58%, above 96% of cities). A high never-married share predicts Democratic voting, and about 31% of adults in Aliso Viejo have never been married, above 78% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Aliso Viejo, CA sits in the top 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 Aliso Viejo looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Aliso Viejo 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 72%, about 12 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Aliso Viejo have completed high school, above 85% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Top-of-the-World, CA D+5
- Laguna Hills, CA D+2
- Laguna Woods, CA D+12
- Laguna Beach, CA D+14
- Laguna Niguel, CA Even
- Mission Viejo, CA R+3
- Lake Forest, CA D+2
- Ladera Ranch, CA Even
- Newport Coast, CA R+10
- San Juan Capistrano, CA R+4
Cities with Similar Populations
- New Castle, PA R+21
- Hammond, LA R+16
- East Lansing, MI D+52
- Yorktown, VA Even
- Opa-Locka, FL D+19
- Poway, CA D+5
- Princeton, FL R+10
- Sherman Oaks, CA D+42
- Bedford, TX R+6
- Ocoee, FL D+6
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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.