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is a town in Lincoln County, Maine, United States. The population was 675 at the 2000 census. Home to the Wiscasset, Waterville & Farmington Railway Museum, Alna includes the early mill village of Head Tide, noted for its historic architecture.
Originally a part of old Pownalborough, the town was settled around 1760 and incorporated in 1794 by the Massachusetts General Court as New Milford. But residents didn't like the name, so it was changed in 1811 to
, Latin for alder, the tree which grows in profusion along the banks of the Sheepscot River. Alna was the site of the first fish hatchery in Maine, started shortly after the Civil War. Between 1895 until 1933, Sheepscot Station was a stop on the narrow gauge Wiscasset, Waterville & Farmington Railway, which is now a heritage railway in town.