When Mary DeLong was born from about 1783 to 1784, in Rutland Town, Rutland, Republic of Vermont, her father, Lawrence DeLong, was 32 and her mother, Sarah Howland, was 28. She married Nathaniel Ketchum about 1828, in South Crosby, Leeds, Upper Canada, British Colonial America. They were the parents of at least 1 son. She died on 24 June 1864, in Elgin, Rideau Lakes, Leeds and Grenville, Canada West, British Colonial America, at the age of 81, and was buried in Elgin, Rideau Lakes, Leeds and Grenville, Ontario, Canada.