20634 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 75% of adults in 20634 typically vote, above the U.S. average of about 62%. Among adults in 20634, ~43% vote Democratic, ~32% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 20634 compares
Among zip codes within 15 miles, 20634 leans more Democratic than 26 of 27 neighbors.
20634 runs about 14 points more Republican than Maryland as a whole.
Politics vary noticeably by block within 20634. The east side runs the most Democratic (D+27) and the southeast side runs the most Republican (R+10), a spread of about 37 points.
Why 20634 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 20634, not a ranked or complete list of what matters most.
Areas with many never-married adults vote Democratic. About 36% of adults in 20634 have never been married, modestly above similar-sized zip codes (around 26%).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 20634, MD sits above the national average 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 20634 looks the way it does
Turnout in 20634 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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 Maryland State Board 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.