Chatham is a town in Columbia County, United States. New York, United States. The population was 4,249 at the 2000 census.
The Town of Chatham has a village also called Chatham on its south town line. The town is at the north border of Columbia County.
The early settlers were Dutch, but later Quakers and New Englanders arrived. The Town of Chatham was formed from the Towns of Canaan and Kinderhook in 1795. Contradictory of its current condition or image, Chatham, in fact, was an industrial center of multiple inter-state rail lines in the early 1900s, including the Boston and Albany Line, as well as the New York Central line, from the Harlem Valley.