80021 leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 77% of adults in 80021 typically vote, above the U.S. average of about 62%. Among adults in 80021, ~48% vote Democratic, ~29% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How 80021 compares
Among zip codes within 15 miles, 80021 leans more Democratic than 20 of 54 neighbors.
80021 runs about 12 points more Democratic than Colorado as a whole.
Politics vary noticeably by block within 80021. The north side is the most Democratic-leaning (D+45) and the southwest side is the least Democratic-leaning (D+10), a spread of about 35 points.
Why 80021 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 80021, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 55% of adults in 80021 hold a bachelor's degree, about 27 points above the U.S. average of 28%. Dense areas vote Democratic, and 80021 sits in the top fifth on density (about 83%, above 84% of zip codes). A high never-married share predicts Democratic voting, and about 38% of adults in 80021 have never been married, above 84% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 80021, CO sits in the top quarter nationally on this measure.
Why turnout in 80021 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 80021 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 98% of adults in 80021 have completed high school, above 93% 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 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.