As of the census[1] of 2000, there were 400 people, 151 households, and 115 families residing in the township.

There were 174 housing units at an average density of 4.7 per square mile (1.8/km2).

There were 151 households, out of which 31.1% had children under the age of 18 living with them, 70.9% were married couples living together, 3.3% had a female householder with no husband present, and 23.2% were non-families.

20.5% of all households were made up of individuals, and 6.6% had someone living alone who was 65 years of age or older.

Notable people from Boon Lake have included Charles D. McEwen, a member of the Minnesota House of Representatives in the 1890s,[4] and his granddaughter Sarah Ramsland, who moved to Canada and became in 1918 the first woman ever elected to serve in the Legislative Assembly of Saskatchewan.