22151 leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 80% of adults in 22151 typically vote, above the U.S. average of about 62%. Among adults in 22151, ~50% vote Democratic, ~30% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How 22151 compares
Among zip codes within 15 miles, 22151 leans more Democratic than 13 of 105 neighbors.
22151 runs about 21 points more Democratic than Virginia as a whole.
Why 22151 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 22151, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 87% of residents in 22151 live in densely developed areas, about 50 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 22151 sits in the top quarter (about 56%, above 92% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 22151, VA sits in the top quarter nationally on this measure.
Why turnout in 22151 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 22151 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.