Missouri Valley leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 96% of adults in Missouri Valley typically vote, above the U.S. average of about 62%. Among adults in Missouri Valley, ~31% vote Democratic, ~65% Republican, and ~4% don't vote. The map below shows estimated turnout by block group.
How Missouri Valley compares
Among cities within 25 miles, Missouri Valley leans more Republican than 4 of 36 neighbors.
Missouri Valley runs about 22 points more Republican than Iowa as a whole.
Politics vary noticeably by neighborhood within Missouri Valley. The northwest side is the most Republican-leaning (R+47) and the east side is the least Republican-leaning (R+29), a spread of about 19 points.
Why Missouri Valley 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 Missouri Valley, not a ranked or complete list of what matters most.
Missouri Valley votes Republican even though it is densely developed (about 27%, modestly above the Iowa average of 16%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Missouri Valley, IA sits in the top quarter nationally on this measure.
Why turnout in Missouri Valley looks the way it does
Turnout in Missouri Valley sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Loveland, IA R+44
- California Junction, IA R+44
- Logan, IA R+44
- Modale, IA R+50
- Magnolia, IA R+48
- Honey Creek, IA R+43
- Fort Calhoun, NE R+40
- Mondamin, IA R+48
- Blair, NE R+38
- Woodbine, IA R+45
Cities with Similar Populations
- Livingston, AL D+33
- Adams, TN R+56
- Horseshoe Bay, TX R+52
- Ragland, AL R+80
- Waverly City, OH R+39
- Owenton, KY R+62
- Dover Plains, NY R+15
- Lovelock, NV R+46
- Bradley Beach, NJ D+16
- Mount Olive, MS R+15
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.