Monmouth leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 35% of adults in Monmouth typically vote, below the U.S. average of about 62%. Among adults in Monmouth, ~13% vote Democratic, ~22% Republican, and ~65% don't vote. The map below shows estimated turnout by block group.
How Monmouth compares
Among cities within 25 miles, Monmouth leans more Republican than 24 of 40 neighbors.
Monmouth runs about 46 points more Republican than California as a whole. California leans Democratic overall, while Monmouth is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Monmouth. The southwest side is the most Republican-leaning (R+32) and the northwest side is the least Republican-leaning (R+19), a spread of about 13 points.
Why Monmouth 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 Monmouth, not a ranked or complete list of what matters most.
Monmouth votes against the grain of California. California leans Democratic overall, while Monmouth runs about 46 points more Republican. Low college attainment predicts Republican voting, and Monmouth sits in the bottom quarter (about 15%, below 79% of cities). A high family-household share predicts Republican voting, and about 77% of households in Monmouth are family households, above 83% of cities.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Monmouth, CA sits in the bottom 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 Monmouth looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Monmouth 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 38% of households in Monmouth rent, above 93% of cities. High food insecurity lines up with lower turnout, and about 24% of adults in Monmouth report food insecurity, above 89% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Elm View, CA R+36
- Fowler, CA R+13
- Wildflower, CA R+36
- Selma, CA Even
- Caruthers, CA R+23
- Laton, CA R+37
- Burrel, CA R+27
- Del Rey, CA R+5
- Kingsburg, CA R+34
- Parlier, CA D+14
Cities with Similar Populations
- Deschutes Junction, OR R+17
- Alba, PA R+56
- Jay City, IN R+74
- Eddyville, IL R+59
- Potts Grove, PA R+54
- Oak Ridge, AL R+81
- Cornersville, MS R+74
- Morrison, WI R+48
- Stockholm, ME R+37
- Onslow, IA R+40
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.