20115 leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 74% of adults in 20115 typically vote, above the U.S. average of about 62%. Among adults in 20115, ~30% vote Democratic, ~45% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 20115 compares
Among zip codes within 15 miles, 20115 leans more Republican than 9 of 19 neighbors.
20115 runs about 26 points more Republican than Virginia as a whole. Virginia leans Democratic overall, while 20115 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 20115. The south side is the most Republican-leaning (R+28) and the east side is the least Republican-leaning (R+9), a spread of about 19 points.
Why 20115 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 20115, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 78% of households in 20115 are family households, about 12 points above the U.S. average of 67%. 20115 runs against the grain of Virginia, a Republican-leaning pocket in a Democratic-leaning state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 20115, VA sits in the top quarter 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 20115 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20115 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 70%, about 10 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.