Sheridan County leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 75% of adults in Sheridan County typically vote, above the U.S. average of about 62%. Among adults in Sheridan County, ~20% vote Democratic, ~55% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Sheridan County compares
Politically, Sheridan County sits close to the rest of Wyoming.
Politics vary noticeably by city within Sheridan County. The northeast side is the most Republican-leaning (R+65) and the east side is the least Republican-leaning (R+42), a spread of about 23 points.
Why Sheridan 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 Sheridan County, not a ranked or complete list of what matters most.
Sheridan County votes Republican even though it is densely developed (about 54%, far above the Wyoming average of 12%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Sheridan County, WY sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Sheridan County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sheridan 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 67%, about 7 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Sheridan County have completed high school, above 97% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Johnson County, WY R+60
- Big Horn County, MT Even
- Big Horn County, WY R+73
- Washakie County, WY R+64
- Rosebud County, MT R+20
- Campbell County, WY R+65
- Powder River County, MT R+72
- Park County, WY R+51
- Hot Springs County, WY R+57
- Treasure County, MT R+66
Counties with Similar Populations
- Muhlenberg County, KY R+55
- Freeborn County, MN R+22
- Jefferson County, ID R+71
- Caroline County, VA R+15
- Wabash County, IN R+48
- Bolivar County, MS D+34
- Clare County, MI R+40
- Elk County, PA R+42
- Williamsburg County, SC D+26
- McCurtain County, OK R+55
Sources and methodology
Precinct-level voting records used to fit the model come from Wyoming 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.