80603 leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 73% of adults in 80603 typically vote, above the U.S. average of about 62%. Among adults in 80603, ~28% vote Democratic, ~45% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 80603 compares
Among zip codes within 15 miles, 80603 leans more Republican than 15 of 17 neighbors.
80603 runs about 36 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 80603 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 80603. The southeast side is the most Republican-leaning (R+39) and the southwest side is the least Republican-leaning (R+15), a spread of about 24 points.
Why 80603 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 80603, not a ranked or complete list of what matters most.
80603 votes against the grain of Colorado. Colorado leans Democratic overall, while 80603 runs about 36 points more Republican. A high family-household share predicts Republican voting, and about 78% of households in 80603 are family households, above 88% of zip codes.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 80603, CO sits in the top tenth nationally on this measure.
Why turnout in 80603 looks the way it does
Homeowners vote more often than renters. About 92% of households in 80603 own their home, about 17 points above the Colorado average of 75%. Limited routine healthcare access lines up with lower turnout, and 80603 sits in the bottom quarter on routine-care measures. 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.