Sandyville is a city in Warren County, Iowa, United States.

[4] According to the United States Census Bureau, the city has a total area of 0.51 square miles (1.32 km2), all of it land.

There were 24 housing units at an average density of 48.7 per square mile (18.8/km2).

Hispanic or Latino persons of any race comprised 1.7% of the population.

There were 28 housing units at an average density of 54.9 per square mile (21.2/km2).

26.1% of all households were made up of individuals, and 13% had someone living alone who was 65 years of age or older.

There were 28 housing units at an average density of 54.9 per square mile (21.2/km2).

33.3% of all households were made up of individuals, and 11.1% had someone living alone who was 65 years of age or older.