Portneuf, ID Political Map | Democrat & Republican Areas in Portneuf

By the BestNeighborhood data science team. Last updated May 2026.

Portneuf leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.

 

About 66% of adults in Portneuf typically vote, near the U.S. average of about 62%. Among adults in Portneuf, ~18% vote Democratic, ~48% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.

How Portneuf compares

Among cities within 25 miles, Portneuf leans more Republican than 6 of 23 neighbors.

Portneuf runs about 9 points more Republican than Idaho as a whole.

Why Portneuf 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 Portneuf, not a ranked or complete list of what matters most.

Areas with many family households vote Republican. About 91% of households in Portneuf are family households, about 24 points above the U.S. average of 67%. Rural areas vote Republican, and Portneuf sits in the bottom quarter on density (about 3%, below 92% of cities).

Never-married share, developed land, and voter turnout

Places that combine a low never-married share and a rural land-use pattern tend to turn out at a higher rate, as Portneuf, ID does.

Why turnout in Portneuf looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Portneuf 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 70%, about 10 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Portneuf have completed high school, above 84% of cities. Learn more about the findings and methodology on the political spectrum map.

Sources and methodology

Precinct-level voting records used to fit the model come from Idaho 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.