Smithton is a city in Pettis County, Missouri, United States.

It was named for Gen. George R. Smith, a railroad promoter,[4] or for General Thomas A.

[5] According to the United States Census Bureau, the city has a total area of 0.30 square miles (0.78 km2), all land.

There were 224 housing units at an average density of 746.7 per square mile (288.3/km2).

19.9% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older.

20.1% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.