Fairfield leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 51% of adults in Fairfield typically vote, below the U.S. average of about 62%. Among adults in Fairfield, ~31% vote Democratic, ~20% Republican, and ~49% don't vote. The map below shows estimated turnout by block group.
How Fairfield compares
Among cities within 25 miles, Fairfield leans more Democratic than 16 of 40 neighbors.
Politically, Fairfield sits close to the rest of California.
Politics vary noticeably by neighborhood within Fairfield. The east side is the most Democratic-leaning (D+30) and the west side is the least Democratic-leaning (D+7), a spread of about 23 points.
Why Fairfield 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 Fairfield, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 73% of residents in Fairfield live in densely developed areas, about 37 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 36% of adults in Fairfield have never been married, above 89% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Fairfield, CA sits in the top tenth nationally on this measure.
Why turnout in Fairfield looks the way it does
Renters vote less often than owners. About 35% of households in Fairfield rent, about 10 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 7% of homes in Fairfield have more than one occupant per room, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Suisun City, CA D+27
- Travis Afb, CA Even
- Vacaville, CA D+5
- Cordelia, CA Even
- Elmira, CA R+30
- Denverton, CA D+17
- American Canyon, CA D+29
- Napa, CA D+32
- Vallejo, CA D+38
- Binghamton, CA R+29
Cities with Similar Populations
- Vista, CA D+10
- Warren, MI D+10
- Clovis, CA R+12
- Pflugerville, TX D+28
- Rock Hill, SC Even
- Cambridge, MA D+74
- Tuscaloosa, AL D+24
- East Los Angeles, CA D+41
- Gresham, OR D+15
- Ventura, CA D+22
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.