When Leslie Paul Arnett was born on 14 April 1908, in Oklahoma, United States, his father, Lawrence Leslie Arnett, was 22 and his mother, Nannie Marguerite Kinkade, was 21. He married Helen Chiquita Green on 22 January 1927, in Klamath Falls, Klamath, Oregon, United States. They were the parents of at least 1 son and 2 daughters. He lived in Klamath Falls, Klamath, Oregon, United States in 1930 and Shasta Election Precinct, Klamath, Oregon, United States in 1940. He died on 17 September 1995, in Medford, Jackson, Oregon, United States, at the age of 87, and was buried in Klamath Falls, Klamath, Oregon, United States.