When Anna Williams was born on 23 November 1864, in Cardiff, Glamorgan, Wales, United Kingdom, her father, Edward M Williams, was 30 and her mother, Margaret Phillips, was 24. She married Dallas Mason on 23 January 1882, in Council Bluffs, Pottawattamie, Iowa, United States. They were the parents of at least 3 sons and 5 daughters. She lived in Omaha, Douglas, Nebraska, United States in 1885 and Florence Election Precinct, Douglas, Nebraska, United States in 1900. She died on 26 December 1920, in Pocatello, Bannock, Idaho, United States, at the age of 56, and was buried in Lava Hot Springs, Bannock, Idaho, United States.