20105 leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 84% of adults in 20105 typically vote, above the U.S. average of about 62%. Among adults in 20105, ~49% vote Democratic, ~35% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 20105 compares
Among zip codes within 15 miles, 20105 leans more Democratic than 10 of 33 neighbors.
20105 runs about 10 points more Democratic than Virginia as a whole.
Politics vary noticeably by block within 20105. The east side is the most Democratic-leaning (D+27) and the southwest side is the least Democratic-leaning (D+5), a spread of about 22 points.
Why 20105 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 20105, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 75% of adults in 20105 hold a bachelor's degree, about 47 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in 20105 is about 45%, about 28 points below the U.S. average of 72%.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 20105, VA sits in the top quarter nationally on this measure.
Why turnout in 20105 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20105 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 76%, about 16 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 91% of households in 20105 own their home, about 16 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 97% of adults in 20105 have completed high school, above 89% of zip codes. 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.