South Dennis, MA population, income and ZIP codes

South Dennis CDP is a small town in Massachusetts, with 3,190 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #149 of 248 ranked by population — larger than 40% of them. The median age here is 55.2 years against 39.1 nationally, a markedly older profile that usually tracks retirees staying put and younger households leaving for work. 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 South Dennis CDP earn a median of $86,500 a year, 10.1% above the national figure of $78,538 and 13% 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 4.5% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in South Dennis CDP is valued at $454,400, 49.8% above the national figure and 9% below the $497,400 peer median, while median gross rent runs $1,542 a month, 9.7% above the national figure, or roughly $18,504 across a full year. A household on the local median income would put about 21.4% 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 5.3×, against roughly 3.9× nationally, so buying is harder here than in the average US market. 80.8% 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. Gross rent folds in the utilities a tenant pays separately, so it is closer to the real monthly outlay than a headline rent figure.

A median age of 55.2 puts South Dennis CDP well into retirement-weighted territory, which pulls median household income down even where household wealth is high, because retirement draws are counted differently from wages.

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.