Onida, South Dakota Demographics & Population 2026
During the 2020–2024 ACS period, Onida, South Dakota had a total population of 644, the 129th largest city in South Dakota, with a median household income of $70,000, which is 7% lower than the state average. The poverty rate is 4.9%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- An exceptionally low poverty rate of 4.9% — among the lowest in South Dakota.
Onida Quick Facts
How Onida 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 | 658 | 644 | -2.1% |
| Median household income | $71,050 | $70,000 | -1.5% |
| Median home value | $187,000 | $178,600 | -4.5% |
How Onida 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+)
Onida Rankings in South Dakota
Explore South Dakota Rankings
Other Cities in Sully County
Cities Similar to Onida
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Menno | 653 | $65,833 | $111,500 | 20.5% | 9.0% |
| Faulkton | 670 | $63,750 | $99,600 | 22.3% | 13.4% |
| Murdo | 599 | $67,045 | $132,400 | 23.7% | 21.7% |
| Parmelee | 584 | N/A | N/A | 9.3% | 84.9% |
| Plankinton | 603 | $74,833 | $114,800 | 27.5% | 15.6% |
A note before these figures: with a population of 644, Onida'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
Onida is a small community located in South Dakota, within Sully County. The total population is 644. It ranks as the 129th most populous out of 439 Census-designated places in South Dakota.
Age Demographics
The median age in Onida is 42.2 years. This is 11% higher than the state median of 38.0 years. 11.0% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Onida is $70,000. This is 7% lower than the state median of $75,081. It is also 13% lower than the national median of $80,734. The poverty rate stands at 4.9%. This is 59% lower than the state poverty rate of 11.9%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The survey records no unemployed residents in Onida, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $178,600. Housing costs are 31% lower than the state median of $257,400. With a home-value-to-income ratio of just 2.6x, Onida is one of the most affordable housing markets in the area. 80.1% of occupied housing units are owner-occupied. This homeownership rate is 17% higher than the state average of 68.6%.
Race & Ethnicity
Onida has a predominantly White (non-Hispanic) population, comprising 94.1% of all residents. Black or African American residents account for 1.7%.
Education
29.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 7% lower than the state rate of 31.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.9%.
Data Sources & Methodology
All demographic data for Onida, 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.
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Frequently Asked Questions
What is the population of Onida, South Dakota?
Onida, South Dakota has a population of 644 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Onida, SD?
The median household income in Onida is $70,000, which is 13% lower than the national median of $80,734.
What is the poverty rate in Onida, SD?
The poverty rate in Onida is 4.9%. This means approximately 31 residents live below the federal poverty line.
What is the racial makeup of Onida, South Dakota?
Onida's population is 94.1% White, 1.7% Black, 0.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Onida, SD?
The median home value in Onida is $178,600. The home-value-to-income ratio is 2.6x.
How educated is Onida, South Dakota?
29.6% of adults (25+) in Onida hold a bachelor's degree or higher, and 7.0% hold a graduate or professional degree.