Ayer is a town in Middlesex County, Massachusetts, United States. Originally part of Groton, it was incorporated February 14, 1871, and became a major commercial railroad junction. The town was home to Camp Stevens, a training camp for Massachusetts volunteers during the American Civil War. Later, Fort Devens was established by the feder…Ayer is a town in Middlesex County, Massachusetts, United States. Originally part of Groton, it was incorporated February 14, 1871, and became a major commercial railroad junction. The town was home to Camp Stevens, a training camp for Massachusetts volunteers during the American Civil War. Later, Fort Devens was established by the federal government to train New England soldiers for World War I. Fort Devens is a major influence on the area, although it is considerably smaller than when it was first closed in the mid-1990s. The town's population was 8,479 at the 2020 census.
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