San Mar, MD population, income and ZIP codes

San Mar CDP is a very small community in Maryland, with 433 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #391 of 536 ranked by population — larger than 27% of them. The median age here is 66.9 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 San Mar CDP earn a median of $88,056 a year, 12.1% above the national figure of $78,538 and 19% below the $109,026 median for the 332 Maryland 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 20.8% of residents here, well above the 12.4% national rate, which is the single clearest signal in this dataset that median income here is carried by a narrow band of households.

The typical owner-occupied home in San Mar CDP is valued at $259,600, 14.4% below the national figure and 35% below the $397,200 peer median, while median gross rent runs $618 a month, 56% below the national figure, or roughly $7,416 across a full year. A household on the local median income would put about 8.4% 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. 69.9% 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.

A median age of 66.9 puts San Mar 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. 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.

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.