21037 is a true toss-up. About 49% of voters here vote Democratic and 51% Republican.
About 91% of adults in 21037 typically vote, above the U.S. average of about 62%. Among adults in 21037, ~45% vote Democratic, ~46% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How 21037 compares
Among zip codes within 15 miles, 21037 sits roughly in the middle of the political spectrum, with 19 neighbors leaning further in the place's direction and 16 leaning the other way.
21037 runs about 31 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21037 sits closer to the political middle.
Politics vary noticeably by block within 21037. The northwest side runs the most Democratic (D+11) and the south side runs the most Republican (R+14), a spread of about 25 points.
Why 21037 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 21037, not a ranked or complete list of what matters most.
21037 votes against the grain of Maryland. Maryland leans Democratic overall, while 21037 runs about 31 points more Republican.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 21037, 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 21037 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 21037 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%. Homeowners vote more often than renters, and about 89% of households in 21037 own their home, above 83% of zip codes. High high-school completion lines up with higher turnout, and about 96% of adults in 21037 have completed high school, above 81% 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.