Sulphur Springs leans heavily Republican by roughly 50 points: about 25% of voters vote Democratic and 75% Republican.
About 82% of adults in Sulphur Springs typically vote, above the U.S. average of about 62%. Among adults in Sulphur Springs, ~20% vote Democratic, ~62% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Sulphur Springs compares
Among cities within 25 miles, Sulphur Springs leans more Republican than 17 of 36 neighbors.
Sulphur Springs runs about 36 points more Republican than Iowa as a whole.
Why Sulphur Springs leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Sulphur Springs. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; Sulphur Springs, IA sits in the bottom quarter nationally on this measure.
Why turnout in Sulphur Springs looks the way it does
Turnout in Sulphur Springs sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Newell, IA R+47
- Lakeside, IA R+5
- Juniata, IA R+37
- Nemaha, IA R+51
- Varina, IA R+53
- Storm Lake, IA R+7
- Truesdale, IA R+47
- Fonda, IA R+44
- Albert City, IA R+47
- Early, IA R+52
Cities with Similar Populations
- Rulo, NE R+62
- Riverside, WY R+48
- Lisbon, TN R+78
- Quinby, VA R+22
- Kalvesta, KS R+79
- Florence, NY R+52
- Litchville, ND R+55
- Grovania, GA R+54
- Medicine Lake, MT R+59
- Pont, PA R+50
Sources and methodology
Precinct-level voting records used to fit the model come from Iowa 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.