Delta is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 84% of adults in Delta typically vote, above the U.S. average of about 62%. Among adults in Delta, ~20% vote Democratic, ~64% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Delta compares
Among cities within 25 miles, Delta leans more Republican than 41 of 54 neighbors.
Delta runs about 40 points more Republican than Iowa as a whole.
Why Delta leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Delta, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 9% of adults in Delta hold a bachelor's degree, about 15 points below the Iowa average of 24%.
Developed land and Republican lean
Places with a rural land-use pattern tend to lean Republican; Delta, IA sits below the national average on this measure. Developed land does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Delta looks the way it does
Turnout in Delta 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
- What Cheer, IA R+50
- Rose Hill, IA R+53
- Hayesville, IA R+46
- Sigourney, IA R+39
- Indianapolis, IA R+56
- Fremont, IA R+52
- Martinsburg, IA R+54
- Hedrick, IA R+50
- Keomah Village, IA R+53
Cities with Similar Populations
- Valley Hill, KY R+55
- Carmack, MS R+78
- Yuma, TN R+68
- East Townsend, OH R+51
- Coffee City, TX R+67
- Oakesdale, WA R+50
- South Cambridge, VT D+22
- Comins, MI R+48
- North Liberty, OH R+63
- Old Dime Box, TX R+47
All Local Stats
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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.