Petersburg is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 76% of adults in Petersburg typically vote, above the U.S. average of about 62%. Among adults in Petersburg, ~17% vote Democratic, ~59% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How Petersburg compares
Among cities within 25 miles, Petersburg leans more Republican than 56 of 57 neighbors.
Petersburg runs about 40 points more Republican than Iowa as a whole.
Why Petersburg 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 Petersburg, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In Petersburg, about 99% of residents are non-Hispanic white, about 27 points above the U.S. average of 72%; about 18% of adults hold a bachelor's degree, about 6 points below the Iowa average of 24%.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as Petersburg, IA does.
Why turnout in Petersburg looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Petersburg 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 68%, about 8 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 90% of households in Petersburg own their home, above 80% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Earlville, IA R+49
- New Vienna, IA R+47
- Colesburg, IA R+51
- Greeley, IA R+56
- Dyersville, IA R+34
- Delaware, IA R+46
- Luxemburg, IA R+46
- Wood, IA R+51
- Osterdock, IA R+50
- Delhi, IA R+42
Cities with Similar Populations
- Rabbit Hill, GA R+40
- Faceville, GA R+35
- Nugent, TX R+79
- Gillespie, VA R+69
- Pumpkintown, TN R+71
- Wishram, WA R+39
- Shacklefords, VA R+34
- Ryder, ND R+34
- Kaneville, PA R+58
- New Swanzy, MI R+21
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.