Williamstown, NJ population, income and ZIP codes

Williamstown CDP is a mid-size town in New Jersey, with 14,855 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #82 of 700 ranked by population — larger than 88% of them. The median age here is 40.6 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 Williamstown CDP earn a median of $87,021 a year, 10.8% above the national figure of $78,538 and 19% below the $106,926 median for the 543 New Jersey cities we cover. Household income here is measured before tax and pooled across everyone at the address, which is why it reads higher than typical individual earnings in the same area. Poverty reaches 7.3% of residents here, below the 12.4% national rate.

The typical owner-occupied home in Williamstown CDP is valued at $255,000, 16% below the national figure and 38% below the $412,500 peer median, while median gross rent runs $1,262 a month, 10.2% below the national figure, or roughly $15,144 across a full year. A household on the local median income would put about 17.4% 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 2.9×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 79.6% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. The rent line includes utilities paid by the tenant, a definition worth remembering when comparing it against a landlord's quoted rate.

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.