81621 leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 84% of adults in 81621 typically vote, above the U.S. average of about 62%. Among adults in 81621, ~50% vote Democratic, ~34% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 81621 compares
Among zip codes within 15 miles, 81621 is the least Democratic-leaning.
81621 runs about 10 points more Democratic than Colorado as a whole.
Politics vary noticeably by block within 81621. The northwest side runs the most Democratic (D+32) and the southeast side runs the most Republican (R+5), a spread of about 37 points.
Why 81621 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 81621, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 56% of adults in 81621 hold a bachelor's degree, about 28 points above the U.S. average of 28%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 81621, CO 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 81621 looks the way it does
Turnout in 81621 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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 Colorado Secretary of State, 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.