Montclair leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 40% of adults in Montclair typically vote, below the U.S. average of about 62%. Among adults in Montclair, ~23% vote Democratic, ~17% Republican, and ~60% don't vote. The map below shows estimated turnout by block group.
How Montclair compares
Among cities within 25 miles, Montclair leans more Democratic than 54 of 90 neighbors.
Montclair runs about 5 points more Republican than California as a whole.
Why Montclair 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 Montclair, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Montclair live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 41% of adults in Montclair have never been married, above 94% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Montclair, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Montclair looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Montclair is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 44% of households in Montclair rent, about 19 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 30% of adults in Montclair report food insecurity, above 95% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Claremont, CA D+34
- Pomona, CA D+28
- Upland, CA Even
- Ontario, CA D+13
- Chino, CA Even
- La Verne, CA D+3
- Chino Hills, CA R+4
- San Dimas, CA D+4
- Rancho Cucamonga, CA Even
- Diamond Bar, CA D+11
Cities with Similar Populations
- Hinesville, GA D+27
- Midvale, UT D+22
- Los Altos, CA D+40
- Wenatchee, WA R+5
- Temple City, CA D+13
- Atlantic City, NJ D+40
- Menomonee Falls, WI R+7
- Crossville, TN R+58
- Holyoke, MA D+27
- Blackwood, NJ D+2
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.