Berwick leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 77% of adults in Berwick typically vote, above the U.S. average of about 62%. Among adults in Berwick, ~29% vote Democratic, ~48% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Berwick compares
Among cities within 25 miles, Berwick leans more Republican than 25 of 67 neighbors.
Berwick runs about 14 points more Republican than Iowa as a whole.
Politics vary noticeably by neighborhood within Berwick. The west side is the most Republican-leaning (R+29) and the south side is the least Republican-leaning (R+4), a spread of about 25 points.
Why Berwick 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 Berwick, not a ranked or complete list of what matters most.
Berwick votes Republican even though it is densely developed (about 38%, well above the Iowa average of 16%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 83% of households in Berwick are family households, above 95% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Berwick, IA sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Berwick looks the way it does
Turnout in Berwick 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
- Altoona, IA R+5
- Bondurant, IA R+18
- Pleasant Hill, IA R+8
- Ankeny, IA R+3
- Des Moines, IA D+2
- Ivy, IA R+32
- Santiago, IA R+27
- Elkhart, IA R+34
- Mitchellville, IA R+22
- Alleman, IA R+34
Cities with Similar Populations
- Ohioview, PA R+35
- Villanow, GA R+76
- Hodges, VA R+42
- Quinhagak, AK D+19
- Beaver Crossing, NE R+63
- Willow Lake, SD R+62
- Plymell, KS R+68
- Shoals Junction, SC R+52
- Redvale, CO R+51
- Pinson, GA R+74
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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.