81503 leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 84% of adults in 81503 typically vote, above the U.S. average of about 62%. Among adults in 81503, ~31% vote Democratic, ~53% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 81503 compares
Among zip codes within 15 miles, 81503 leans more Republican than 6 of 10 neighbors.
81503 runs about 38 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 81503 is one of the few Republican-leaning pockets.
Why 81503 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 81503, not a ranked or complete list of what matters most.
81503 votes against the grain of Colorado. Colorado leans Democratic overall, while 81503 runs about 38 points more Republican. Dense places usually vote Democratic, but 81503 runs against that pattern.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 81503, CO sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 81503 looks the way it does
Turnout in 81503 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.