What is the population of Mountainside borough?

Mountainside borough has 6,967 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #230 of 700 in New Jersey.

What is the median household income in Mountainside borough?

Median household income in Mountainside borough is $210,100 a year, 167.5% above the national figure of $78,538.

How much does it cost to rent or buy in Mountainside borough?

Median gross rent is $3,501 a month and the median home value is $755,600, so rent absorbs about 20% of median household income.

Is Mountainside borough affordable compared with the rest of the US?

Homes cost about 3.6× the local median income here versus roughly 3.9× nationally, so Mountainside borough is more affordable to buy in than the typical US market, and rent takes 20% of median income against the 30% cost-burden line.

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New Jersey · Census place 48510

Mountainside, NJ population, income and ZIP codes

Quick answer

The population of the city of Mountainside, New Jersey (Mountainside, NJ — Census place “Mountainside borough”) is 6,967 residents, ranking #230 of 700 places in New Jersey. Median household income is $210,100, the median home is worth $755,600 and median gross rent runs $3,501 a month. Looking for the Mountainside New Jersey ZIP code list? 1 ZIP codes serve Mountainside, NJ: 07092.

Population: 6,967Mountainside borough residents
Median household income: $210,100Past 12 months, inflation adjusted
Median home value: $755,600Owner-occupied units
Median gross rent: $3,501Rent plus utilities, monthly
Median age: 48.7 yrsAll residents
Homeownership rate: 86.9%Owner-occupied households

Mountainside ZIP codes (New Jersey)

Census ZCTAs whose delivery area overlaps Mountainside.

The Mountainside NJ ZIP code list below covers 1 ZIP code. Open any one for its population, income, housing and rent profile.

07092

What the numbers mean in Mountainside borough

Housing cost measured against local earnings.

A household earning the Mountainside borough median would spend about 20% of gross income on the median rent. The 30% mark is the federal threshold for cost burden, so anything above it signals a stretched rental market. The median home costs 3.6× the median household income; nationally that ratio sits near 4.5×. Poverty affects 2.8% of residents and 86.9% of households own their home.

Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year

Mountainside borough, NJ in context

How this area compares with national benchmarks.

Mountainside borough is a mid-size town in New Jersey, with 6,967 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #230 of 700 ranked by population — larger than 67% of them. The median age here is 48.7 years against 39.1 nationally, a markedly older profile that usually tracks retirees staying put and younger households leaving for work. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in Mountainside borough earn a median of $210,100 a year, 167.5% above the national figure of $78,538 and 96% above the $106,926 median for the 543 New Jersey cities we cover. The median is the midpoint household, not an average, so a handful of very high earners cannot drag it upward the way they distort a mean. Poverty reaches 2.8% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Mountainside borough is valued at $755,600, 149% above the national figure and 83% above the $412,500 peer median, while median gross rent runs $3,501 a month, 149% above the national figure, or roughly $42,012 across a full year. A household on the local median income would put about 20% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is within the standard affordability guideline. The home-price-to-income ratio works out to 3.6×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 86.9% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

Every value on this page is published directly by the Census for this area — nothing is modelled or interpolated. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.

Compare with nearby places

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Frequently asked questions

Common questions about this area.

What is the population of Mountainside borough?: Mountainside borough has 6,967 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #230 of 700 in New Jersey.
What is the median household income in Mountainside borough?: Median household income in Mountainside borough is $210,100 a year, 167.5% above the national figure of $78,538.
How much does it cost to rent or buy in Mountainside borough?: Median gross rent is $3,501 a month and the median home value is $755,600, so rent absorbs about 20% of median household income.
Is Mountainside borough affordable compared with the rest of the US?: Homes cost about 3.6× the local median income here versus roughly 3.9× nationally, so Mountainside borough is more affordable to buy in than the typical US market, and rent takes 20% of median income against the 30% cost-burden line.
How current is this Mountainside borough data?: All figures come from the US Census Bureau American Community Survey 2019-2023 ACS 5-year five-year estimates. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.