Mountain Plains CDP, South Dakota Demographics & Population 2026

Population Overview

Mountain Plains CDP is a small community located in South Dakota. The total population is 412. It ranks as the 173rd most populous out of 439 cities and towns in South Dakota.

Age Demographics

The median age in Mountain Plains CDP is 62.6 years. This is 66% higher than the state median of 37.7 years. Only 4.1% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Mountain Plains CDP is $166,641. This is 130% higher than the state median of $72,421. Compared to the national median of $78,538, household income here is 112% higher. The poverty rate stands at 0.0%. This is 100% lower than the state poverty rate of 12.0%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 8.5%. This is 184% higher than the state rate of 3.0%. The median home value is $606,100. Housing costs are 156% higher than the state median of $236,800. The home-value-to-income ratio is 3.6x. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 46% higher than the state average of 68.6%.

Race & Ethnicity

Mountain Plains CDP has a predominantly White (non-Hispanic) population, comprising 89.3% of all residents. Asian residents account for 4.4%. The Hispanic or Latino population (0.7%) is well below the state average of 4.6%. The Asian population is significantly higher than the state average (4.4% vs 1.4%).

Education

44.4% of residents aged 25 and older hold a bachelor's degree or higher. This places Mountain Plains CDP in the top 10% of all cities in the state for educational attainment. This is 43% higher than the state rate of 31.1%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.2%.

Data Sources & Methodology

All demographic data for Mountain Plains CDP, South Dakota is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against South Dakota state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 439 Census-designated places in South Dakota. For official data, visit data.census.gov.