Auburn is a city in and the county seat of Androscoggin County, Maine, United States. The population was 23,055 at the 2010 census. It is one of two principal cities of and included in the Lewiston-Auburn, Maine metropolitan New England city and town area and the Lewiston-Auburn, Maine metropolitan statistical area (which is part of the Portland-Lewiston-South Portland, Maine combined statistical area). Auburn and Lewiston (directly across the Androscoggin River) are known as the Twin Cities. The area was originally part of the Pejepscot Purchase, land bought in 1714 by a consortium from Boston and Portsmouth following the Treaty of Portsmouth, which brought peace between the Abenaki Indians and English settlements. But in 1736, the Massachusetts General Court granted a large section of the land to veterans of the 1690 Battle of Quebec. Conflicting claims led to prolonged litigation. Consequently, settlement was delayed until after the French and Indian Wars.