20889 is a Democratic stronghold. About 84% of voters here vote Democratic and 16% Republican.
About 81% of adults in 20889 typically vote, above the U.S. average of about 62%. Among adults in 20889, ~68% vote Democratic, ~13% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How 20889 compares
Among zip codes within 15 miles, 20889 leans more Democratic than 86 of 125 neighbors.
20889 runs about 40 points more Democratic than Maryland as a whole.
Why 20889 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 20889, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 94% of residents in 20889 live in densely developed areas, about 57 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 78% of adults in 20889 have never been married, in the top fraction of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 20889, MD sits in the top tenth 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 20889 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20889 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and more than 99% of adults in 20889 have completed high school, in the top fraction 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.