Angostura, South Dakota Demographics & Population 2026

A note before these figures: with a population of 144, Angostura's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Angostura is a small community located in South Dakota, within Fall River County. The total population is 144. It ranks as the 266th most populous out of 439 Census-designated places in South Dakota.

Age Demographics

The median age in Angostura is 53.9 years. This is 42% higher than the state median of 38.0 years.

Economy, Income & Housing

The median household income in Angostura is $104,688. This is 39% higher than the state median of $75,081. It is also 30% higher than the national median of $80,734. The ACS records no residents below the poverty line in Angostura. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The survey records no unemployed residents in Angostura, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $573,300. Housing costs are 123% higher than the state median of $257,400. The home-value-to-income ratio is 5.5x. 93.8% of occupied housing units are owner-occupied. This homeownership rate is 37% higher than the state average of 68.6%.

Race & Ethnicity

Angostura has a predominantly White (non-Hispanic) population, comprising 93.1% of all residents.

Education

39.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 24% higher than the state rate of 31.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample. Notably, 28.1% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Angostura, South Dakota is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. 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. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.