Glendora is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.
About 67% of adults in Glendora typically vote, near the U.S. average of about 62%. Among adults in Glendora, ~33% vote Democratic, ~34% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How Glendora compares
Among cities within 25 miles, Glendora sits roughly in the middle of the political spectrum, with 87 neighbors leaning further in the place's direction and 16 leaning the other way.
Glendora runs about 20 points more Republican than California as a whole. California leans Democratic overall, while Glendora sits closer to the political middle.
Politics vary noticeably by neighborhood within Glendora. The west side runs the most Democratic (D+12) and the east side runs the most Republican (R+15), a spread of about 27 points.
Why Glendora 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 Glendora, not a ranked or complete list of what matters most.
Glendora votes against the grain of California. California leans Democratic overall, while Glendora runs about 20 points more Republican.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Glendora, CA sits in the top tenth nationally on this measure.
Why turnout in Glendora looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Glendora 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 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Citrus, CA D+22
- Azusa, CA D+22
- Covina, CA D+14
- San Dimas, CA D+4
- Vincent, CA D+22
- La Verne, CA D+3
- Irwindale, CA D+24
- West Covina, CA D+20
- Duarte, CA D+24
- Bradbury, CA D+4
Cities with Similar Populations
- Asheboro, NC R+33
- Evans, GA R+27
- Olive Branch, MS R+12
- New Iberia, LA R+24
- Morgan Hill, CA D+13
- Minnetonka, MN D+33
- Collierville, TN R+20
- New Bern, NC R+8
- Vero Beach, FL R+27
- Brookline, MA D+72
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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.