Brookside is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 86% of adults in Brookside typically vote, above the U.S. average of about 62%. Among adults in Brookside, ~41% vote Democratic, ~45% Republican, and ~14% don't vote. The map below shows estimated turnout by block group.
How Brookside compares
Among cities within 25 miles, Brookside leans more Republican than 123 of 235 neighbors.
Brookside runs about 9 points more Republican than New Jersey as a whole.
Why Brookside leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Brookside. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Brookside, NJ sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Brookside looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Brookside 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 78%, about 18 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Brookside own their home, about 17 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and more than 99% of adults in Brookside have completed high school, in the top fraction of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Mendham, NJ Even
- Randolph, NJ D+7
- Morristown, NJ D+23
- Chester, NJ R+7
- Bernardsville, NJ Even
- Mine Hill, NJ R+3
- Victory Gardens, NJ D+19
- Succasunna, NJ R+16
- Morris Plains, NJ D+11
- Madisonville, NJ Even
Cities with Similar Populations
- Elimsport, PA R+70
- Orcas, WA D+56
- Sagola, MI R+38
- Midlothian, MD R+25
- Deltana, AK R+43
- Cash Corner, ME D+47
- Jump, OH R+67
- Dunlow, WV R+71
- Endicott, KY R+71
- Ivy Ridge, NC R+22
All Local Stats
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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.