Borough in Union County, New Jersey · 4 sq mi · 1,856 people per sq mi
About 7,400 people live in Mountainside. The typical household earns $211,538, and the median resident is 48 years old.
2026 projection
From 7,007 in 2020
Poverty rate 3.73%
Men 47.9 · Women 48.1
1900–2026
7,418
2026 projection
5.9% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1900–2026
7,418
2026 projection
5.9% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 7,418 | +72 | 0.98% |
|---|---|---|---|
| 2025 | 7,346 | +49 | 0.67% |
| 2024 | 7,297 | +198 | 2.79% |
| 2023 | 7,099 | +87 | 1.24% |
| 2022 | 7,012 | -14 | 0.20% |
| 2021 | 7,026 | +19 | 0.27% |
| 2020 | 7,007 | +119 | 1.73% |
| 2019 | 6,888 | +22 | 0.32% |
| 2018 | 6,866 | +25 | 0.37% |
| 2017 | 6,841 | +17 | 0.25% |
Showing 10 of 28 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 70 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 27 residents
71% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 71% | 69% | 73% |
| Never married | 20% | 22% | 17% |
| Divorced | 5% | 5% | 5% |
| Widowed | 4% | 4% | 3% |
| Separated | <1% | 0% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau