There were 209 households out of which 31.1% had children under the age of 18 living with them, 58.9% were married couples living together, 9.1% had a female householder with no husband present, and 30.1% were non-families. 26.3% of all households were made up of individuals and 13.9% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.03. In the city, the population was spread out with 26.7% under the age of 18, 8.3% from 18 to 24, 27.8% from 25 to 44, 19.3% from 45 to 64, and 18.0% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 81.2 males. For every 100 females age 18 and over, there were 85.6 males. The median income for a household in the city was $28,125, and the median income for a family was $34,286. Males had a median income of $22,404 versus $18,750 for females. The per capita income for the city was $13,664. About 6.2% of families and 13.4% of the population were below the poverty line, including 19.7% of those under age 18 and 11.9% of those age 65 or over. Public education in Sheldon is administered by Sheldon R-VIII School District. Sheldon has a public library, the Sheldon City Library.