When Andrew Jackson Hosmer was born on 2 October 1858, in New Boston, Wayne, Michigan, United States, his father, Andrew Jackson Hosmer, was 29 and his mother, Martha Caroline Eldred, was 27. He married Letitia Fell on 17 December 1890, in Belleville, Wayne, Michigan, United States. They were the parents of at least 1 son and 1 daughter. He lived in Salt Lake City, Salt Lake, Utah, United States in 1900 and Salt Lake City Ward 5, Salt Lake City, Salt Lake, Utah, United States for about 10 years. He died on 22 July 1947, in Los Angeles, California, United States, at the age of 88, and was buried in New Boston, Wayne, Michigan, United States.