Margaret Foster was born on 8 February 1750, in New Milford, Litchfield, Connecticut, United States as the daughter of Foster. She married Elijah Buck on 24 September 1770, in New Milford, Litchfield, Connecticut, United States. They were the parents of at least 11 sons and 2 daughters. She lived in Elmira, Chemung, New York, United States in 1800. She died on 10 April 1824, in Chemung, Chemung, Chemung, New York, United States, at the age of 74, and was buried in Elmira, Chemung, New York, United States.