Kennebec County is a county located in the U.S. state of Maine, in the United States. As of the 2010 census, the population was 122,151. Its county seat is Augusta, the state capital. The county was established on 20 February 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."Kennebec County comprises the Augusta–Waterville, ME Micropolitan Statistical Area.In 2010, the center of population of Maine was located in Kennebec County, in the city of Augusta.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (8.8%) is water.Adjacent countiesSomerset County, Maine – northWaldo County, Maine – eastSagadahoc County, Maine – southLincoln County, Maine – southAndroscoggin County, Maine – southwestFranklin County, Maine – northwest