Grain Valley leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 80% of adults in Grain Valley typically vote, above the U.S. average of about 62%. Among adults in Grain Valley, ~30% vote Democratic, ~51% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How Grain Valley compares
Among cities within 25 miles, Grain Valley leans more Republican than 31 of 76 neighbors.
Grain Valley runs about 7 points more Republican than Missouri as a whole.
Politics vary noticeably by neighborhood within Grain Valley. The north side is the most Republican-leaning (R+34) and the west side is the least Republican-leaning (R+12), a spread of about 22 points.
Why Grain 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 Grain Valley, not a ranked or complete list of what matters most.
Grain Valley votes Republican even though it is densely developed (about 57%, far above the Missouri average of 22%). 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; Grain Valley, MO sits in the top tenth nationally on this measure.
Why turnout in Grain Valley looks the way it does
Turnout in Grain Valley 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
- Blue Springs, MO R+7
- Oak Grove, MO R+40
- Lake Tapawingo, MO Even
- Tarsney Lakes, MO R+43
- Lake Lotawana, MO R+31
- Buckner, MO R+38
- Sni Mills, MO R+55
- Levasy, MO R+57
- Lake City, MO R+51
- Bates City, MO R+58
Cities with Similar Populations
- Uvalde, TX R+18
- Jacksonville, AL R+28
- Weirton, WV R+34
- Fulton, NY R+22
- Brunswick, ME D+38
- Clarksburg, WV R+29
- Stevenson Ranch, CA D+5
- Dixon, IL R+13
- Mccomb, MS D+27
- Crestwood, KY R+24
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Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.