Auburn is a city in south-central Maine, within the United States. The city serves as the county seat of Androscoggin County. The population was 24,061 at the 2020 census. Auburn and its sister city Lewiston are known locally as the Twin Cities or Lewiston–Auburn (L–A).

Androscoggin County is a county in the U.S. state of Maine. As of the 2020 census, the county's population was 111,139. Its county seat is Auburn and its most populous city is Lewiston.