Vassalboro is a town in Kennebec County, Maine, United States. The population was 4,520 at the 2020 census. Vassalboro includes the villages of Riverside, Getchell's Corner, North Vassalboro, and East Vassalboro, home to the town library and sports field. Vassalboro is included in the Augusta, Maine, micropolitan New England City and Town Area.

Kennebec County is a county located in the South-central portion of the U.S. state of Maine. At the 2020 census, the population was 123,642. Its county seat is Augusta, the state capital. The county was established on February 20, 1799, from portions of Cumberland and Lincoln Counties. The name Kennebec comes from the Eastern Abenaki /kínipekʷ/, meaning "large body of still water, large bay."