Boiling Spring Lakes is a city in Brunswick County, North Carolina, United States. The population was 5,943 at the 2020 census, up from 5,372 …Boiling Spring Lakes is a city in Brunswick County, North Carolina, United States. The population was 5,943 at the 2020 census, up from 5,372 in 2010. Boiling Spring Lakes was incorporated as a town in 1961.