According to the 1835 census, Bolsøy had a population of 2,391. On 1 January 1877, the Sotnakken farm (population: 19) was added to Bolsøy Municipality from Nesset Municipality.
The 1835 census recorded Bolsøy's population as 2,391. In 1877, the Sotnakken farm, with a population of 19, was incorporated into Bolsøy Municipality from Nesset Municipality.