Unified School District · NJ
Mountainside Borough School District
Mountainside Borough School District is a unified school district in New Jersey with a community population of 7,049. The median household income is $211,538 and the median age is 48.0.
7,049
Population
1764
People / sq mi
$211,538
Median Income
48.0
Median Age
Mountainside Borough School District covers 4 sq mi of land at 1763.6 people per square mile.
Race & Ethnicity
| White | 74.0% |
| Black or African American | 0.0% |
| Asian | 55.6% |
| Hispanic or Latino (any race) | 0.0% |
Economy & Income
$211,538
Median Household Income
$84,985
Per Capita Income
4.1%
Poverty Rate
2.1%
Unemployment
Housing
$810,300
Median Home Value
$3,501
Median Rent
87.9%
Homeownership
Education Attainment
96.2%
High School+
67.3%
Bachelor's+
Other New Jersey School Districts
Largest Cities in New Jersey
Largest Counties in New Jersey
Congressional Districts in New Jersey
State rankings
Frequently Asked Questions
Mountainside Borough School District serves a community with a population of 7,049 according to the latest Census ACS 5-Year estimates. This unified school district is located in New Jersey.
The median household income in Mountainside Borough School District is $211,538, with a per capita income of $84,985. The poverty rate is 4.1%.
Mountainside Borough School District is 74.0% White, 0.0% Black or African American, 55.6% Asian, and 0.0% Hispanic or Latino, per Census ACS data.
In Mountainside Borough School District, 96.2% of adults have a high school diploma or higher, and 67.3% hold a bachelor's degree or higher, per Census ACS estimates.
The median home value in Mountainside Borough School District is $810,300, with a median rent of $3,501. The homeownership rate is 87.9%.
More from New Jersey
Data for Mountainside Borough School District from the American Community Survey 5-Year estimates. Land area from Census Gazetteer files. This is a unified school district (GEOID: 3411040).
The this entity record above pulls directly from the U.S. Census Bureau ACS and decennial files. What follows is the per-entity context — how this entity sits in the broader U.S. population demographics distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the the U.S. Census Bureau ACS and decennial files portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. states, metros, cities, and ZIPs with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: U.S. Census Bureau ACS, 2026.