South Yarmouth, MA population, income and ZIP codes

South Yarmouth CDP is a mid-size town in Massachusetts, with 11,642 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #85 of 248 ranked by population — larger than 65% of them. The median age here is 55 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 South Yarmouth CDP earn a median of $79,638 a year, 1.4% above the national figure of $78,538 and 20% below the $99,537 median for the 222 Massachusetts cities we cover. Median household income counts every pre-tax dollar arriving at an address — wages, self-employment, Social Security, pensions, interest and public assistance — for everyone living there, so multi-earner households pull the figure up even where individual pay is modest. Poverty reaches 9.3% of residents here, below the 12.4% national rate.

The typical owner-occupied home in South Yarmouth CDP is valued at $465,100, 53.3% above the national figure and 6% below the $497,400 peer median, while median gross rent runs $1,665 a month, 18.4% above the national figure, or roughly $19,980 across a full year. A household on the local median income would put about 25.1% 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 5.8×, against roughly 3.9× nationally, so buying is harder here than in the average US market. 77.9% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. 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.

A median age of 55 puts South Yarmouth 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.

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.