San Luis leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.
About 65% of adults in San Luis typically vote, near the U.S. average of about 62%. Among adults in San Luis, ~45% vote Democratic, ~20% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How San Luis compares
Among cities within 25 miles, San Luis is the most Democratic-leaning.
San Luis runs about 30 points more Democratic than Colorado as a whole.
Politics vary noticeably by neighborhood within San Luis. The northeast side is the most Democratic-leaning (D+44) and the west side is the least Democratic-leaning (D+33), a spread of about 11 points.
Why San Luis leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in San Luis. The lean here lands roughly where demographic data alone would predict.
Park access and Democratic lean
Places with heavy park coverage tend to lean Democratic; San Luis, CO sits in the top quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in San Luis looks the way it does
Areas with limited routine healthcare access turn out at lower rates. San Luis is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 22%, about 11 points above the Colorado average of 11%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- San Pedro, CO D+33
- Los Fuertes, CO D+33
- Viejo San Acacio, CO D+33
- San Pablo, CO D+30
- Chama, CO D+32
- San Acacio, CO D+28
- Jaroso, CO D+33
- Costilla, NM D+26
- Fort Garland, CO D+3
Cities with Similar Populations
- Granville Center, MA R+17
- Harlansburg, PA R+51
- Pactolus, KY R+62
- Interlaken, NJ R+11
- North Orwell, PA R+62
- Thornton, MI R+45
- Nelson, MN R+52
- Saulsbury, WV R+60
- Lake Norden, SD R+70
- Tyrone, KY R+48
All Local Stats
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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.