When Mary Garnet was born on 7 March 1817, in Chawton, Hampshire, England, United Kingdom, her father, James Garnet, was 19 and her mother, Frances Mitchell, was 21. She married William Port on 23 May 1839, in Froyle, Hampshire, England, United Kingdom. They were the parents of at least 7 sons and 5 daughters. She lived in Froyle, Hampshire, England, United Kingdom for about 10 years. She died on 18 April 1895, in Salt Lake City, Salt Lake, Utah Territory, United States, at the age of 78, and was buried in Salt Lake City Cemetery, Salt Lake City, Salt Lake, Utah Territory, United States.