Niangua is a city in Webster County, Missouri, United States.

Niangua is part of the Springfield, Missouri Metropolitan Statistical Area.

[7] According to the United States Census Bureau, the city has a total area of 0.41 square miles (1.06 km2), all land.

There were 200 housing units at an average density of 487.8 per square mile (188.3/km2).

29.9% of all households were made up of individuals, and 15.5% had someone living alone who was 65 years of age or older.

There were 202 housing units at an average density of 494.1 per square mile (190.8/km2).

27.9% of all households were made up of individuals, and 11.7% had someone living alone who was 65 years of age or older.