81128 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 91% of adults in 81128 typically vote, above the U.S. average of about 62%. Among adults in 81128, ~42% vote Democratic, ~49% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How 81128 compares
81128 runs about 19 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 81128 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 81128. The southwest side is the most Republican-leaning (R+15) and the north side is the least Republican-leaning (R+3), a spread of about 12 points.
Why 81128 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 81128, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 2% of residents in 81128 live in densely developed areas, about 34 points below the Colorado average of 35%. 81128 runs against the grain of Colorado, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 81128, CO sits in the bottom tenth 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 81128 looks the way it does
Homeowners vote more often than renters. About 96% of households in 81128 own their home, about 21 points above the Colorado average of 75%. High high-school completion lines up with higher turnout, and about 96% of adults in 81128 have completed high school, above 80% 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.