Duncan is a Republican stronghold. About 25% of voters here vote Democratic and 75% Republican.
About 60% of adults in Duncan typically vote, near the U.S. average of about 62%. Among adults in Duncan, ~15% vote Democratic, ~45% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How Duncan compares
Among cities within 25 miles, Duncan is the least Republican-leaning.
Politically, Duncan sits close to the rest of Oklahoma.
Politics vary noticeably by neighborhood within Duncan. The southwest side is the most Republican-leaning (R+61) and the north side is the least Republican-leaning (R+47), a spread of about 14 points.
Why Duncan 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 Duncan, not a ranked or complete list of what matters most.
Duncan votes Republican even though it is densely developed (about 56%, far above the Oklahoma average of 18%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as Duncan, OK does.
Why turnout in Duncan looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Duncan is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 31% of households in Duncan rent, above 86% of cities. High food insecurity lines up with lower turnout, and about 21% of adults in Duncan report food insecurity, above 83% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Empire City, OK R+70
- Sunray, OK R+71
- Marlow, OK R+64
- Bray, OK R+73
- Comanche, OK R+63
- Central High, OK R+72
- Gas City, OK R+74
- Corum, OK R+73
- Velma, OK R+72
- Addington, OK R+71
Cities with Similar Populations
- Mill Creek East, WA D+23
- Waukee, IA Even
- Marietta, OH R+29
- Ives Estates, FL D+35
- Festus, MO R+42
- Avon, OH R+8
- Newport, RI D+47
- Wyandotte, MI R+6
- Douglas, GA R+22
- Selden, NY R+20
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Sources and methodology
Precinct-level voting records used to fit the model come from Oklahoma State Election Board, 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.