20660 leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About more than 99% of adults in 20660 typically vote, above the U.S. average of about 62%. Among adults in 20660, ~39% vote Democratic, ~68% Republican, and ~-7% don't vote. The map below shows estimated turnout by block group.
How 20660 compares
Among zip codes within 15 miles, 20660 leans more Republican than 19 of 28 neighbors.
20660 runs about 57 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 20660 is one of the few Republican-leaning pockets.
Why 20660 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 20660, not a ranked or complete list of what matters most.
20660 votes against the grain of Maryland. Maryland leans Democratic overall, while 20660 runs about 57 points more Republican.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as 20660, MD does.
Why turnout in 20660 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20660 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 99% of adults in 20660 have completed high school, above 97% 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.