When Earl Clarence Nelson was born on 4 July 1910, in Wibaux, Wibaux, Montana, United States, his father, Christian Adolph Nelson, was 41 and his mother, Anna Stacia Dunn, was 32. He married Matilda Ann Eichhorn on 9 September 1933. They were the parents of at least 2 sons. He lived in Judicial Township 1, Placer, California, United States in 1940. He died on 10 February 1967, in Placer, California, United States, at the age of 56, and was buried in Sylvan Cemetery, Citrus Heights, Sacramento, California, United States.