Sinclair is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 89% of adults in Sinclair typically vote, above the U.S. average of about 62%. Among adults in Sinclair, ~21% vote Democratic, ~68% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Sinclair compares
Among cities within 25 miles, Sinclair leans more Republican than 45 of 48 neighbors.
Sinclair runs about 41 points more Republican than Iowa as a whole.
Why Sinclair 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 Sinclair, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 77% of households in Sinclair are family households, about 10 points above the U.S. average of 67%.
High-school completion, developed land, and voter turnout
Places that combine high-school-completion-heavy adults and a rural land-use pattern tend to turn out at a higher rate, as Sinclair, IA does.
Why turnout in Sinclair looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sinclair 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 70%, about 10 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Sinclair have completed high school, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Stout, IA R+49
- Holland, IA R+52
- Dike, IA R+35
- Parkersburg, IA R+38
- New Hartford, IA R+40
- Grundy Center, IA R+43
- Morrison, IA R+38
- Wellsburg, IA R+50
- Aplington, IA R+46
- Zaneta, IA R+34
Cities with Similar Populations
- Hautala Corner, MI R+11
- Hootentown, KY R+61
- Sugarfork, NC R+31
- Decatur City, IA R+46
- Yaleville, NY R+26
- Indian Gap, TX R+76
- Clipper Mills, CA R+27
- Royal, PA R+45
- Max, MN R+21
- Ettersburg, CA D+13
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.