Belle Plaine is a city in Sumner County, Kansas, United States. As of the 2010 census, the city population was 1,681.
Belle Plaine was founded in 1871. Belle Plaine is a French name meaning "beautiful plain". In 1883, Belle Plaine was a station and shipping point for the Southern Central & Fort Scott Railway. By 1910, it was at the junction of two railroads, the Missouri Pacific and the Atchison, Topeka & Santa Fe. The first post office in Belle Plaine was established in April 1871. In the fall of 1871 and spring of 1872, Miss Olive North taught a subscription school; and, in 1873, school district (No. 2) was established.
Belle Plaine is located at 37°23′39″N 97°16′45″W (37.394214, -97.279076). 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.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Belle Plaine has a humid subtropical climate, abbreviated "Cfa" on climate maps.
As of the census of 2010, there were 1,681 people, 630 households, and 466 families residing in the city.