There are 28 US Post Offices in Kennebec County serving a total of 143,406 residents equating to 5,122 residents per post office. It's estimated that approximately 228,892 packages are handled across the 28 county post offices annually. Kennebec County is a county located in the 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 /k\u00ednipek\u02b7/, meaning \"large body of still water, large bay.\" Kennebec County comprises the Augusta\u2013Waterville, ME Micropolitan Statistical Area. In 2010, the center of population of Maine was located in Kennebec County, in the city of Augusta."