Castlewood city, South Dakota Demographics & Population 2026
As of 2026, Castlewood city, South Dakota has a total population of 756, the 105th largest city in South Dakota, with a median household income of $87,768, which is 21% higher than the state average. The poverty rate is 3.0%.
Key Takeaways
- An exceptionally low poverty rate of 3.0% — among the lowest in South Dakota.
- Housing is very affordable with a home-value-to-income ratio of just 2.0x.
- Near full employment with an unemployment rate of just 2.1%.
Castlewood city Quick Facts
How Castlewood city Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
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: 33 | National average: 60
Education
Educational Attainment (Adults 25+)
Castlewood city Rankings in South Dakota
Explore South Dakota Rankings
Other Cities in Hamlin County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Estelline city | 862 | $74,231 | 7.5% | $139,000 |
| Lake Norden city | 769 | $71,923 | 4.8% | $201,400 |
| Bryant city | 761 | $60,592 | 27.8% | $136,700 |
| Hayti town | 393 | $78,333 | 3.6% | $116,400 |
| Hazel town | 132 | $104,375 | 0.8% | $175,000 |
Cities Similar to Castlewood city
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Wanblee CDP | 744 | N/A | N/A | 13.5% | 42.6% |
| Wonderland Homes CDP | 782 | $88,500 | $250,700 | 18.5% | 0.0% |
| Alexandria city | 725 | $92,500 | $168,300 | 30.7% | 1.8% |
| Colton city | 802 | $82,639 | $186,000 | 14.7% | 13.3% |
| Hill City city | 699 | $85,714 | $246,700 | 27.1% | 3.9% |
Population Overview
Castlewood city is a small community located in South Dakota, within Hamlin County. The total population is 756. It ranks as the 105th most populous out of 439 cities and towns in South Dakota.
Age Demographics
The median age in Castlewood city is 36.9 years. This is 2% lower than the state median of 37.7 years. With 33.2% of the population under 18, Castlewood city has a notably young demographic profile, suggesting a family-oriented community.
Economy, Income & Housing
The median household income in Castlewood city is $87,768. This is 21% higher than the state median of $72,421. Compared to the national median of $78,538, household income here is 12% higher. The poverty rate stands at 3.0%. This is 75% 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 2.1%. This is 29% lower than the state rate of 3.0%. The median home value is $178,600. Housing costs are 25% lower than the state median of $236,800. With a home-value-to-income ratio of just 2.0x, Castlewood city is one of the most affordable housing markets in the area. 83.8% of occupied housing units are owner-occupied. This homeownership rate is 22% higher than the state average of 68.6%.
Race & Ethnicity
Castlewood city has a predominantly White (non-Hispanic) population, comprising 88.6% of all residents. Black or African American residents account for 0.7%. The Black or African American population (0.7%) is well below the state average of 2.2%. The Hispanic or Latino population (0.7%) is well below the state average of 4.6%.
Education
25.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 17% lower 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 97.9%.
Data Sources & Methodology
All demographic data for Castlewood city, 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.
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Frequently Asked Questions
What is the population of Castlewood city, South Dakota?
Castlewood city, South Dakota has a population of 756 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Castlewood city, SD?
The median household income in Castlewood city is $87,768, which is 12% higher the national median of $78,538.
What is the poverty rate in Castlewood city, SD?
The poverty rate in Castlewood city is 3.0%. This means approximately 23 residents live below the federal poverty line.
What is the racial makeup of Castlewood city, South Dakota?
Castlewood city's population is 88.6% White, 0.7% Black, 0.7% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Castlewood city, SD?
The median home value in Castlewood city is $178,600. The home-value-to-income ratio is 2.0x.
How educated is Castlewood city, South Dakota?
25.7% of adults (25+) in Castlewood city hold a bachelor's degree or higher, and 3.8% hold a graduate or professional degree.