Belle Plaine is a city in Sumner County, Kansas, United States.

[5] In 1883, Belle Plaine was a station and shipping point for the Southern Central & Fort Scott Railway.

[6] By 1910, it was at the junction of two railroads, the Missouri Pacific and the Atchison, Topeka & Santa Fe.

[6] According to the United States Census Bureau, the city has a total area of 0.91 square miles (2.36 km2), all of it land.

[9] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

[10] The 2020 United States census counted 1,467 people, 588 households, and 411 families in Belle Plaine.

There were 653 housing units at an average density of 786.7 per square mile (303.8/km2).

24.7% of households consisted of individuals and 13.4% had someone living alone who was 65 years of age or older.

23.5% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older.

26.0% of all households were made up of individuals, and 13.9% had someone living alone who was 65 years of age or older.

The community is served by Belle Plaine USD 357 public school district.