Fairfax, VA Political Map | Democrat & Republican Areas in Fairfax

By the BestNeighborhood data science team. Last updated May 2026.

Fairfax leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.

 

About 75% of adults in Fairfax typically vote, above the U.S. average of about 62%. Among adults in Fairfax, ~50% vote Democratic, ~25% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.

How Fairfax compares

Among cities within 25 miles, Fairfax leans more Democratic than 77 of 191 neighbors.

Fairfax runs about 29 points more Democratic than Virginia as a whole.

Politics vary noticeably by neighborhood within Fairfax. The northeast side is the most Democratic-leaning (D+45) and the southwest side is the least Democratic-leaning (D+20), a spread of about 25 points.

Why Fairfax 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 Fairfax, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 69% of adults in Fairfax hold a bachelor's degree, about 40 points above the U.S. average of 28%. Dense areas vote Democratic, and Fairfax sits in the top fifth on density (about 91%, above 97% of cities). A high never-married share predicts Democratic voting, and about 34% of adults in Fairfax have never been married, above 85% of cities.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Fairfax, VA sits in the top tenth nationally on this measure.

Why turnout in Fairfax looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Fairfax 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 74%, about 14 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.

Sources and methodology

Precinct-level voting records used to fit the model come from Virginia Department of 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.