Mountainside is a borough in Union County, New Jersey, with a population of approximately 7,020.
How Mountainside Ranks
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Recent News
All news →NewsAPR 25, 2026
Borough of Mountainside Presents Plaque To Family of Marilyn and David Hart Who Are Remembered for Dedication and Service
Borough of Mountainside Presents Plaque To Family of Marilyn and David Hart Who Are Remembered for Dedication and Service TAPinto
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NewsAPR 23, 2026
Mountainside Restoration Committee’s Annual Spring Plant Sale Returns to Support Local History
Mountainside Restoration Committee’s Annual Spring Plant Sale Returns to Support Local History TAPinto
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NewsAPR 17, 2026
Mountainside’s BSA Troop 177 Celebrates 35th Eagle Scout: Frankie Kelly
Mountainside’s BSA Troop 177 Celebrates 35th Eagle Scout: Frankie Kelly TAPinto
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The Grant Finder, Rebuilt: Smarter Scoring, Three Finders, and a Pipeline to Track It All
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Data & Analysis
Best Suburbs of Chicago to Live In 2026 — Data, Not Opinions
We scored 206 Chicago suburbs across fiscal health and quality of life using real municipal data — crime, taxes, schools, pensions, income, homeownership, and environmental quality. Winnetka, Lake Forest, and Glencoe top the list.