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Ayer is located at (42.560033, -71.585321). According to the United States Census Bureau, the CDP has a total area of 3.4 km sq (1.3 square miles). 3.2 km sq (1.2 mi sq) of it is land and 0.2 km sq (0.1 mi sq) of it (4.62%) is water. Source: http://en.wikipedia.
