Williamstown, MA population, income and ZIP codes

Williamstown CDP is a small town in Massachusetts, with 4,352 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #131 of 248 ranked by population — larger than 47% of them. The median age here is 21.9 years against 39.1 nationally, a distinctly younger profile, typical of places with students, military posts or a fast-growing family population. At this population the ACS sample is small, so the margin of error around every dollar figure below is wide — treat the numbers as a band, not a point, and expect them to move between annual releases without the place itself changing.

Households in Williamstown CDP earn a median of $82,917 a year, 5.6% above the national figure of $78,538 and 17% below the $99,537 median for the 222 Massachusetts 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 15.9% of residents here, above the 12.4% national rate.

The typical owner-occupied home in Williamstown CDP is valued at $436,900, 44% above the national figure and 12% below the $497,400 peer median, while median gross rent runs $1,244 a month, 11.5% below the national figure, or roughly $14,928 across a full year. A household on the local median income would put about 18% 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 5.3×, against roughly 3.9× nationally, so buying is harder here than in the average US market. 57.8% of occupied homes are owner-occupied versus 65% nationally, so the market leans more heavily on renters. The rent line includes utilities paid by the tenant, a definition worth remembering when comparing it against a landlord's quoted rate.

A median age of 21.9 means a large student or early-career population; income medians in places like this understate household resources, since many residents are supported from outside the address. Median income runs above the national figure while poverty also runs above it — a split distribution, not a uniformly comfortable place. Averages hide that; the two numbers together do not.

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.