When John Colvin III was born in 1710, in Providence, Providence, Rhode Island, United States, his father, John Colvin Jr., was 29 and his mother, Experience Lydia Dart, was 26. He married Amey Randall in 1736, in Providence, Rhode Island, British Colonial America. They were the parents of at least 2 sons and 5 daughters. He died on 6 April 1805, in Scituate, Providence, Rhode Island, United States, at the age of 95.