Marshalltown leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 51% of adults in Marshalltown typically vote, below the U.S. average of about 62%. Among adults in Marshalltown, ~17% vote Democratic, ~34% Republican, and ~49% don't vote. The map below shows estimated turnout by block group.
How Marshalltown compares
Among cities within 25 miles, Marshalltown leans more Republican than 153 of 178 neighbors.
Marshalltown runs about 39 points more Republican than New Jersey as a whole. New Jersey leans Democratic overall, while Marshalltown is one of the few Republican-leaning pockets.
Why Marshalltown 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 Marshalltown, not a ranked or complete list of what matters most.
Marshalltown votes against the grain of New Jersey. New Jersey leans Democratic overall, while Marshalltown runs about 39 points more Republican.
Never-married share and voter turnout
Places with a never-married-heavy adult population tend to turn out at a lower rate; Marshalltown, NJ sits in the top tenth nationally on this measure.
Why turnout in Marshalltown looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Marshalltown is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Pointers, NJ R+34
- Sharptown, NJ R+26
- Mahoneyville, NJ R+24
- Golf Manor, NJ R+14
- Deepwater, NJ R+22
- Portertown, NJ R+33
- Pennsville, NJ R+27
- Penton, NJ R+33
- Carneys Point, NJ D+5
- Marlton Heights, NJ R+18
Cities with Similar Populations
- Pierce, FL R+29
- Antelope, MT R+58
- Zoe, KY R+65
- Dorloo, NY R+41
- Emery Mill, TN R+70
- Pinesville, NY R+17
- Frogtown, IL R+58
- Union, TN R+62
- Hudson, LA R+85
- Ladiga, AL R+84
Sources and methodology
Precinct-level voting records used to fit the model come from New Jersey Division of 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.