When John Carhart was born about 1740, in Rye, Westchester, New York Colony, British Colonial America, his father, Thomas Carhart, was 22 and his mother, Elizabeth Purdy, was 26. He married Hannah Merritt in 1765, in Rye, Westchester, New York, United States. They were the parents of at least 7 sons and 3 daughters. He died on 2 January 1836, in Village of Oxford, Oxford, Chenango, New York, United States, at the age of 96.