When Nancy Mourning Lewis was born on 27 February 1794, in Basking Ridge, Somerset, New Jersey, United States, her father, James Zacharias Lewis, was 36 and her mother, Winnifred Mustain, was 38. She married James McCown on 28 November 1812, in Pittsylvania, Virginia, United States. They were the parents of at least 2 sons and 6 daughters. She lived in Indiana, United States in 1870 and Monroe Township, Washington, Indiana, United States in 1880. She died on 21 August 1885, in Monroe, Indiana, United States, at the age of 91, and was buried in Chambersville Cemetery, Washington Township, Owen, Indiana, United States.