When Milton Sweeney was born about 1807, in Washington, Kentucky, United States, his father, Daniel Sweeney, was 31 and his mother, Elizabeth Jones, was 30. He married Ann Clarke on 31 October 1827, in Washington, Kentucky, United States. They were the parents of at least 1 son and 1 daughter. He lived in Clear Creek Township, Drew, Arkansas, United States in 1870 and Macomb, McDonough, Illinois, United States in 1880. He died on 14 January 1884, in Garnett, Lincoln, Arkansas, United States, at the age of 77.