Monmouth Junction, NJ population, income and ZIP codes

Monmouth Junction CDP is a mid-size town in New Jersey, with 9,457 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #167 of 700 ranked by population — larger than 76% of them. The median age here is 40.2 years against 39.1 nationally, a slightly older profile than the country as a whole. 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 Monmouth Junction CDP earn a median of $125,892 a year, 60.3% above the national figure of $78,538 and 18% 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 7.5% of residents here, below the 12.4% national rate.

The typical owner-occupied home in Monmouth Junction CDP is valued at $497,100, 63.8% above the national figure and 21% above the $412,500 peer median, while median gross rent runs $1,880 a month, 33.7% above the national figure, or roughly $22,560 across a full year. A household on the local median income would put about 17.9% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 3.9×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 63.4% of occupied homes are owner-occupied versus 65% nationally, so the market leans more heavily on renters. 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.

All values below were released by the Census for this exact geography, with no gap-filling on our side. 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.