20176 leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 80% of adults in 20176 typically vote, above the U.S. average of about 62%. Among adults in 20176, ~48% vote Democratic, ~32% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How 20176 compares
Among zip codes within 15 miles, 20176 leans more Democratic than 18 of 30 neighbors.
20176 runs about 14 points more Democratic than Virginia as a whole.
Politics vary noticeably by block within 20176. The west side is the most Democratic-leaning (D+26) and the northeast side is the least Democratic-leaning (Even), a spread of about 25 points.
Why 20176 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 20176, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 57% of adults in 20176 hold a bachelor's degree, about 28 points above the U.S. average of 28%. Dense areas vote Democratic, and 20176 sits in the top fifth on density (about 75%, above 81% of zip codes).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 20176, VA sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 20176 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20176 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 73%, about 13 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.