20664 leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 82% of adults in 20664 typically vote, above the U.S. average of about 62%. Among adults in 20664, ~31% vote Democratic, ~51% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How 20664 compares
Among zip codes within 15 miles, 20664 leans more Republican than 7 of 21 neighbors.
20664 runs about 53 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 20664 is one of the few Republican-leaning pockets.
Why 20664 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 20664, not a ranked or complete list of what matters most.
20664 votes against the grain of Maryland. Maryland leans Democratic overall, while 20664 runs about 53 points more Republican. A high family-household share predicts Republican voting, and about 80% of households in 20664 are family households, above 92% of zip codes.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 20664, MD sits below the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 20664 looks the way it does
Turnout in 20664 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.