Denver County is a Democratic stronghold. About 76% of voters here vote Democratic and 24% Republican.
About 70% of adults in Denver County typically vote, above the U.S. average of about 62%. Among adults in Denver County, ~53% vote Democratic, ~17% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Denver County compares
Among counties within 50 miles, Denver County is the most Democratic-leaning.
Denver County runs about 42 points more Democratic than Colorado as a whole.
Politics vary noticeably by city within Denver County. The east side is the most Democratic-leaning (D+62) and the southwest side is the least Democratic-leaning (D+34), a spread of about 28 points.
Why Denver County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Denver County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 99% of residents in Denver County live in densely developed areas, about 62 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Denver County sits in the top quarter (about 55%, above 98% of counties). A high never-married share predicts Democratic voting, and about 44% of adults in Denver County have never been married, above 97% of counties.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Denver County, CO sits in the top 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 Denver County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Denver County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Arapahoe County, CO D+22
- Jefferson County, CO D+18
- Adams County, CO D+11
- Broomfield County, CO D+25
- Douglas County, CO R+7
- Boulder County, CO D+52
- Gilpin County, CO D+16
- Clear Creek County, CO D+21
- Elbert County, CO R+46
- Weld County, CO R+17
Counties with Similar Populations
- Davidson County, TN D+26
- Lake County, IL D+22
- Jackson County, MO D+24
- Hudson County, NJ D+27
- Polk County, FL R+18
- Norfolk County, MA D+30
- El Paso County, CO R+7
- Will County, IL D+6
- District of Columbia, DC D+80
- Bernalillo County, NM D+21
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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.