As of the census[12] of 2010, there were 329 people, 153 households, and 83 families residing in the city. The population density was 700.0 inhabitants per square mile (270.3/km2). There were 177 housing units at an average density of 376.6 per square mile (145.4/km2). The racial makeup of the city was 97.0% White, 0.9% African American, 0.3% Native American, and 1.8% from two or more races. Hispanic or Latino of any race were 4.6% of the population.
There were 153 households, of which 26.1% had children under the age of 18 living with them, 45.8% were married couples living together, 3.9% had a female householder with no husband present, 4.6% had a male householder with no wife present, and 45.8% were non-families. 42.5% of all households were made up of individuals, and 24.8% had someone living alone who was 65 years of age or older. The average household size was 2.15 and the average family size was 2.95.
The median age in the city was 38.2 years. 26.1% of residents were under the age of 18; 8% were between the ages of 18 and 24; 21% were from 25 to 44; 21% were from 45 to 64; and 24% were 65 years of age or older. The gender makeup of the city was 47.1% male and 52.9% female.
2000 census
As of the census[5] of 2000, there were 324 people, 145 households, and 82 families residing in the city. The population density was 692.1 inhabitants per square mile (267.2/km2). There were 167 housing units at an average density of 356.7 per square mile (137.7/km2). The racial makeup of the city was 99.69% White, and 0.31% from two or more races. Hispanic or Latino of any race were 0.31% of the population.
There were 145 households, out of which 25.5% had children under the age of 18 living with them, 51.0% were married couples living together, 4.1% had a female householder with no husband present, and 42.8% were non-families. 38.6% of all households were made up of individuals, and 23.4% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 3.07.
In the city, the population was spread out, with 27.5% under the age of 18, 4.6% from 18 to 24, 24.7% from 25 to 44, 15.4% from 45 to 64, and 27.8% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 82.0 males. For every 100 females age 18 and over, there were 92.6 males.
The median income for a household in the city was $24,875, and the median income for a family was $36,250. Males had a median income of $27,500 versus $13,056 for females. The per capita income for the city was $16,451. About 2.9% of families and 8.9% of the population were below the poverty line, including none of those under age 18 and 13.8% of those age 65 or over.
^"Station: Roscoe, SD". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). National Oceanic and Atmospheric Administration. Retrieved October 13, 2021.
