Stewartsville is a city in southwest DeKalb County, Missouri, United States.

[4] The community is named for Robert M. Stewart, a former Missouri governor.

[6] The Dalton-Uphoff House was listed on the National Register of Historic Places in 1982.

There were 320 housing units at an average density of 323.2 per square mile (124.8/km2).

24.2% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older.

There were 308 housing units at an average density of 316.3 per square mile (122.1/km2).

24.3% of all households were made up of individuals, and 14.2% had someone living alone who was 65 years of age or older.