Editing Castlewood, South Dakota (section)

==Demographics==
{{US Census population
|1900= 430
|1910= 594
|1920= 582
|1930= 500
|1940= 493
|1950= 498
|1960= 500
|1970= 523
|1980= 557
|1990= 549
|2000= 666
|2010= 627
|2020= 698
|estyear=2022
|estimate=707
|estref=<ref name="USCensusEst2022">{{cite web|url=https://www.census.gov/data/tables/time-series/demo/popest/2020s-total-cities-and-towns.html |date=February 27, 2024|title=City and Town Population Totals: 2020–2022|publisher=United States Census Bureau|accessdate=February 27, 2024}}</ref>
|align-fn=center
|footnote=U.S. Decennial Census<ref>{{cite web|url=https://www.census.gov/programs-surveys/decennial-census.html|title=Census of Population and Housing|publisher=United States Census Bureau|accessdate=June 4, 2015}}</ref><br>2020 Census<ref name="2020 Census (City)"/>
}}

===2020 census===
As of the [[2020 United States census|2020 census]], there were 698 people and 270 households, and 180 families residing in the town.<ref>{{Cite web|title=US Census Bureau, Table P16: Household Type |url=https://data.census.gov/table?q=Castlewood%20city,%20South%20Dakota%20p16&y=2020 |access-date=February 27, 2024 |publisher=United States Census Bureau}}</ref> There were 296 housing units.

===2010 census===
As of the [[2010 United States census|2010 census]], there were 627 people in 260 households, including 158 families, in the city. The population density was {{convert|545.2|PD/sqmi|PD/km2|1}}. There were 292 housing units at an average density of {{convert|253.9|/sqmi|/km2|1}}. The [[Race and ethnicity in the United States Census#2010 census|racial makeup]] of the city was 96.5% White, 0.5% African American, 0.5% Native American, 0.2% Asian, 1.4% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 1.8%.

Of the 260 households 35.4% had children under the age of 18 living with them, 50.4% were married couples living together, 6.9% had a female householder with no husband present, 3.5% had a male householder with no wife present, and 39.2% were non-families. 33.5% of households were one person and 17.6% were one person aged 65 or older. The average household size was 2.41 and the average family size was 3.16.

The median age was 36.2 years. 28.2% of residents were under the age of 18; 7.4% were between the ages of 18 and 24; 26% were from 25 to 44; 24% were from 45 to 64; and 14.5% were 65 or older. The gender makeup of the city was 50.2% male and 49.8% female.

===2000 census===
As of the [[2000 United States census|2000 census]], there were 666 people in 253 households, including 185 families, in the city. The population density was {{convert|585.9|PD/sqmi|PD/km2|sp=us|adj=off}}. There were 265 housing units at an average density of {{convert|233.1|/sqmi|/km2|sp=us|adj=off}}.  The [[Race and ethnicity in the United States Census#2000 census|racial makeup]] of the city was 98.95% White, 0.45% Native American, and 0.60% from two or more races. Hispanic or Latino of any race were 0.30%. 38.1% were of [[Germans|German]], 18.4% [[Norwegians|Norwegian]], 9.9% [[Dutch people|Dutch]], 6.8% [[United States|American]], 6.4% [[Irish people|Irish]] and 5.6% [[English people|English]] ancestry.

Of the 253 households 40.3% had children under the age of 18 living with them, 60.5% were married couples living together, 7.9% had a female householder with no husband present, and 26.5% were non-families. 24.1% of households were one person and 14.2% were one person aged 65 or older. The average household size was 2.57 and the average family size was 3.06.

The age distribution was 28.5% under the age of 18, 8.1% from 18 to 24, 26.6% from 25 to 44, 20.6% from 45 to 64, and 16.2% 65 or older. The median age was 35 years. For every 100 females, there were 94.7 males. For every 100 females age 18 and over, there were 91.9 males.

The median income was $36,607 and the median income for a family was $41,806. Males had a median income of $29,688 versus $20,750 for females. The per capita income for the city was $17,682. About 7.7% of families and 7.1% of the population were below the [[poverty line]], including 12.0% of those under age 18 and 6.7% of those age 65 or over.