20120 leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 72% of adults in 20120 typically vote, above the U.S. average of about 62%. Among adults in 20120, ~45% vote Democratic, ~27% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 20120 compares
Among zip codes within 15 miles, 20120 leans more Democratic than 20 of 48 neighbors.
20120 runs about 19 points more Democratic than Virginia as a whole.
Politics vary noticeably by block within 20120. The southeast side is the most Democratic-leaning (D+32) and the west side is the least Democratic-leaning (D+15), a spread of about 17 points.
Why 20120 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 20120, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 60% of adults in 20120 hold a bachelor's degree, about 32 points above the U.S. average of 28%. Dense areas vote Democratic, and 20120 sits in the top fifth on density (about 80%, above 83% of zip codes). A high never-married share predicts Democratic voting, and about 33% of adults in 20120 have never been married, above 75% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 20120, VA sits in the top tenth nationally on this measure.
Why turnout in 20120 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20120 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 72%, about 12 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.