20658 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 72% of adults in 20658 typically vote, above the U.S. average of about 62%. Among adults in 20658, ~40% vote Democratic, ~32% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 20658 compares
Among zip codes within 15 miles, 20658 leans more Democratic than 7 of 28 neighbors.
20658 runs about 19 points more Republican than Maryland as a whole.
Politics vary noticeably by block within 20658. The north side runs the most Democratic (D+20) and the southwest side runs the most Republican (R+13), a spread of about 33 points.
Why 20658 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 20658, not a ranked or complete list of what matters most.
Areas with many never-married adults vote Democratic. About 33% of adults in 20658 have never been married, above 75% of zip codes.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 20658, MD sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 20658 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20658 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 62%, modestly above similar-sized zip codes (around 48%). Homeowners vote more often than renters, and about 91% of households in 20658 own their home, about 16 points above the U.S. average of 75%. 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.