When Otto Goplen was born on 14 November 1894, in Clinton, Vernon, Wisconsin, United States, his father, Ole Jacob Pedersen Goplen, was 40 and his mother, Kristine Andersdatter Goplen, was 43. He married Bergit Myhre on 19 March 1923. They were the parents of at least 2 sons. He lived in Jefferson, Monroe, Wisconsin, United States in 1910. He died on 3 July 1965, in La Crosse, La Crosse, Wisconsin, United States, at the age of 70, and was buried in Coon Prairie Lutheran Cemetery, Westby, Vernon, Wisconsin, United States.