South Boulder is a Democratic stronghold. About 88% of voters here vote Democratic and 12% Republican.
About 90% of adults in South Boulder typically vote, above the U.S. average of about 62%. Among adults in South Boulder, ~79% vote Democratic, ~11% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.
How South Boulder compares
Among neighborhoods within 5 miles, South Boulder leans more Democratic than 7 of 8 neighbors.
South Boulder runs about 65 points more Democratic than Colorado as a whole.
Why South Boulder leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for South Boulder, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 80% of adults in South Boulder hold a bachelor's degree, about 51 points above the U.S. average of 28%.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as South Boulder, Boulder, CO does.
Why turnout in South Boulder looks the way it does
Areas with strong routine healthcare access turn out at higher rates. South Boulder 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and more than 99% of adults in South Boulder have completed high school, above 92% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Southeast Boulder, Boulder, CO D+69
- Colorado University, Boulder, CO D+62
- Central Boulder, Boulder, CO D+71
- Crossroads, Boulder, CO D+73
- East Boulder, Boulder, CO D+61
- Washington Village, Boulder, CO D+77
- Palo Park, Boulder, CO D+64
- North Boulder, Boulder, CO D+72
- Walnut Grove, Broomfield, CO D+15
- Kings Mill, Broomfield, CO D+24
Neighborhoods with Similar Populations
- East Bakersfield, Bakersfield, CA D+19
- Group 14621, Rochester, NY D+57
- Bohemian California, Chicago, IL D+46
- Gandy-Sun Bay South, Tampa, FL D+3
- Bay Park, San Diego, CA D+30
- Upper Northwood, Baltimore, MD D+87
- Sabre Springs, San Diego, CA D+20
- Adams Morgan, Washington, DC D+83
- Great Northwest, San Antonio, TX D+10
- Audubon, New Orleans, LA D+39
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.