20656 leans Republican by roughly 22 points: about 39% of voters vote Democratic and 61% Republican.
About 99% of adults in 20656 typically vote, above the U.S. average of about 62%. Among adults in 20656, ~39% vote Democratic, ~60% Republican, and ~1% don't vote. The map below shows estimated turnout by block group.
How 20656 compares
Among zip codes within 15 miles, 20656 leans more Republican than 14 of 29 neighbors.
20656 runs about 51 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 20656 is one of the few Republican-leaning pockets.
Why 20656 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 20656, not a ranked or complete list of what matters most.
20656 votes against the grain of Maryland. Maryland leans Democratic overall, while 20656 runs about 51 points more Republican. A high family-household share predicts Republican voting, and about 75% of households in 20656 are family households, above 78% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 20656, MD 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 20656 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20656 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 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 20656 have completed high school, above 93% of zip codes. 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.