80421 leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 92% of adults in 80421 typically vote, above the U.S. average of about 62%. Among adults in 80421, ~39% vote Democratic, ~53% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How 80421 compares
Among zip codes within 15 miles, 80421 is the most Republican-leaning.
80421 runs about 26 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 80421 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 80421. The northeast side runs the most Democratic (D+23) and the southeast side runs the most Republican (R+25), a spread of about 48 points.
Why 80421 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 80421, not a ranked or complete list of what matters most.
80421 votes against the grain of Colorado. Colorado leans Democratic overall, while 80421 runs about 26 points more Republican. Rural areas vote Republican, and 80421 sits in the bottom quarter on density (about 6%, below 76% of zip codes). A high family-household share predicts Republican voting, and about 75% of households in 80421 are family households, above 79% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 80421, 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 80421 looks the way it does
Homeowners vote more often than renters. About 92% of households in 80421 own their home, about 17 points above the Colorado average of 75%. High high-school completion lines up with higher turnout, and about 98% of adults in 80421 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.