Mountain Plains, SD population, income and ZIP codes

Mountain Plains CDP is a very small community in South Dakota, with 412 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #173 of 485 ranked by population — larger than 64% of them. The median age here is 62.6 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 Mountain Plains CDP earn a median of $166,641 a year, 112.2% above the national figure of $78,538 and 154% above the $65,500 median for the 79 South Dakota 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 0% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Mountain Plains CDP is valued at $606,100, 99.8% above the national figure and 214% above the $192,800 peer median, while median gross rent runs not published a month. The home-price-to-income ratio works out to 3.6×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 100% 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 62.6 puts Mountain Plains 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. With 412 residents, a handful of survey responses moves every median on this page. Compare Mountain Plains CDP against its county rather than against national figures.

The Census withheld gross rent for Mountain Plains CDP because the sample was too thin to publish at this geography. Those values were suppressed at the source, not lost in our dataset, and we do not model a replacement. Everything else on this page comes straight from the ACS 2019-2023 ACS 5-year tables.