Erwin, South Dakota Demographics & Population 2026
During the 2020–2024 ACS period, Erwin, South Dakota had a total population of 105, the 297th largest town in South Dakota, with a median household income of $86,250, which is 15% higher than the state average. The poverty rate is 0.0%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Erwin Quick Facts
How Erwin Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 50 | 105 | +110.0% |
| Median household income | $53,750 | $86,250 | +60.5% |
How Erwin Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 35 | National average: 61
Education
Educational Attainment (Adults 25+)
Erwin Rankings in South Dakota
Explore South Dakota Rankings
Other Cities in Kingsbury County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| De Smet | 943 | $67,321 | 4.6% | $165,200 |
| Lake Preston | 596 | $52,396 | 17.0% | $130,000 |
| Badger | 162 | $65,000 | 3.7% | $70,000 |
| Oldham | 75 | $33,750 | 17.3% | N/A |
| Spring Lake Colony | 35 | N/A | 48.6% | N/A |
| Bancroft | 16 | N/A | 0.0% | N/A |
| Hetland | 10 | $46,250 | 0.0% | $57,500 |
Cities Similar to Erwin
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Clearfield Colony | 106 | N/A | N/A | 100.0% | 100.0% |
| Jamesville Colony | 101 | N/A | N/A | 74.2% | 37.1% |
| Dimock | 104 | $92,500 | $187,500 | 19.3% | 3.9% |
| Glendale Colony | 112 | N/A | N/A | 15.2% | 8.9% |
| Naples | 96 | N/A | $106,300 | 0.0% | 53.1% |
A note before these figures: with a population of 105, Erwin'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
Erwin is a small community located in South Dakota, within Kingsbury County. The total population is 105. It ranks as the 297th most populous out of 439 Census-designated places in South Dakota.
Age Demographics
The median age in Erwin is 19.9 years. This is 48% lower than the state median of 38.0 years. With 44.8% of the population under 18, Erwin has a notably young demographic profile, suggesting a family-oriented community.
Economy, Income & Housing
The median household income in Erwin is $86,250. This is 15% higher than the state median of $75,081. It is also 7% higher than the national median of $80,734. The ACS records no residents below the poverty line in Erwin. 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 Erwin, which reflects the size of the sample rather than a labor market without joblessness. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 46% higher than the state average of 68.6%.
Race & Ethnicity
Every resident counted in Erwin was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.
Education
11.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 64% lower 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.
Data Sources & Methodology
All demographic data for Erwin, 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.
Free data download: Get all South Dakota city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Erwin, South Dakota?
Erwin, South Dakota has a population of 105 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Erwin, SD?
The median household income in Erwin is $86,250, which is 7% higher than the national median of $80,734.
What is the poverty rate in Erwin, SD?
The ACS sample for Erwin recorded no residents below the federal poverty line. Because the community is small, this indicates that the survey did not capture poverty here rather than that no poverty exists — the estimate carries a wide margin of error.
What is the racial makeup of Erwin, South Dakota?
Erwin's population is 100.0% White, 0.0% Black, 0.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Erwin, SD?
The Census Bureau does not publish a reliable median home value estimate for Erwin — there are too few owner-occupied homes in the ACS sample. The national median is $332,700.
How educated is Erwin, South Dakota?
11.5% of adults (25+) in Erwin hold a bachelor's degree or higher, and 3.9% hold a graduate or professional degree.