Monrovia leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 61% of adults in Monrovia typically vote, near the U.S. average of about 62%. Among adults in Monrovia, ~39% vote Democratic, ~22% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Monrovia compares
Among cities within 25 miles, Monrovia leans more Democratic than 70 of 114 neighbors.
Monrovia runs about 7 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within Monrovia. The southeast side is the most Democratic-leaning (D+38) and the northeast side is the least Democratic-leaning (D+22), a spread of about 17 points.
Why Monrovia 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 Monrovia, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 95% of residents in Monrovia live in densely developed areas, about 58 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Monrovia sits in the top quarter (about 43%, above 89% of cities). A high never-married share predicts Democratic voting, and about 35% of adults in Monrovia have never been married, above 88% of cities.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Monrovia, CA sits in the top tenth 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 Monrovia looks the way it does
Renters vote less often than owners. About 51% of households in Monrovia rent, about 26 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 7% of homes in Monrovia have more than one occupant per room, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Bradbury, CA D+4
- Duarte, CA D+24
- Arcadia, CA D+14
- Sierra Madre, CA D+30
- Irwindale, CA D+24
- Temple City, CA D+13
- East Pasadena, CA D+33
- Baldwin Park, CA D+28
- El Monte, CA D+26
- Vincent, CA D+22
Cities with Similar Populations
- East Stroudsburg, PA D+12
- Orange, TX R+44
- Perrysburg, OH R+7
- Catonsville, MD D+34
- Levittown, NY R+21
- DeKalb, IL D+28
- Romeoville, IL D+15
- Menlo Park, CA D+64
- Parkersburg, WV R+35
- Trenton, MI R+7
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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.