When Harold Clinton Lamma was born on 26 January 1906, in Cascade, Montana, United States, his father, Harry Alfred Lamma, was 21 and his mother, Zella Holloway, was 21. He married Gladys Irene Matlock on 28 May 1929, in Valier, Pondera, Montana, United States. They were the parents of at least 3 sons and 3 daughters. He lived in Valier, Pondera, Montana, United States in 1930 and School District 18 Valier, Pondera, Montana, United States in 1940. He died on 27 November 1991, in Conrad, Pondera, Montana, United States, at the age of 85, and was buried in Lakeview Cemetery, Valier, Pondera, Montana, United States.