Grand County leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 89% of adults in Grand County typically vote, above the U.S. average of about 62%. Among adults in Grand County, ~42% vote Democratic, ~47% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Grand County compares
Among counties within 50 miles, Grand County leans more Republican than 5 of 6 neighbors.
Grand County runs about 17 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while Grand County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Grand County. The southeast side runs the most Democratic (D+18) and the southwest side runs the most Republican (R+47), a spread of about 65 points.
Why Grand 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 Grand County, not a ranked or complete list of what matters most.
Grand County votes against the grain of Colorado. Colorado leans Democratic overall, while Grand County runs about 17 points more Republican.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; Grand County, CO sits below the national average 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 Grand County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Grand County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 66%, about 6 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 95% of adults in Grand County have completed high school, above 94% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Gilpin County, CO D+16
- Clear Creek County, CO D+21
- Summit County, CO D+23
- Boulder County, CO D+52
- Jackson County, CO R+42
- Broomfield County, CO D+25
- Jefferson County, CO D+18
- Eagle County, CO D+14
- Park County, CO R+9
- Routt County, CO D+12
Counties with Similar Populations
- Leon County, TX R+69
- Jefferson County, GA D+5
- Carroll County, IL R+34
- Mercer County, IL R+33
- Aitkin County, MN R+33
- Henry County, KY R+51
- Osage County, KS R+49
- Jefferson County, IA R+4
- Pemiscot County, MO R+30
- Nottoway County, VA R+9
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.