20175 leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 87% of adults in 20175 typically vote, above the U.S. average of about 62%. Among adults in 20175, ~49% vote Democratic, ~38% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How 20175 compares
Among zip codes within 15 miles, 20175 leans more Democratic than 10 of 25 neighbors.
20175 runs about 7 points more Democratic than Virginia as a whole.
Politics vary noticeably by block within 20175. The northeast side runs the most Democratic (D+26) and the northwest side runs the most Republican (R+2), a spread of about 28 points.
Why 20175 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 20175, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 66% of adults in 20175 hold a bachelor's degree, about 38 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in 20175 is about 67%, below 71% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 20175, VA sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 20175 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20175 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 75%, about 15 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.