Draftsman, William W. Wurster, Architect, San Francisco, CA, c. 1943; Onstad's name was listed as having worked in Wurster's office staff since 1938. Principal, Harold A. Onstad, Architect, c. 1947;

Onstad and his wife lived in Ross, CA, c. 1938. They probably lived in rural surroundings, as they maintained P.O. Box 481 in largely undeveloped Ross of that time. In 1951, Onstad lived in Tiburon, CA, in 1951.

He married Madeline Andrews Powell (born 06/08/1906 in MN-died 01/24/1980 in Monterey, CA) in Ada, ID, on 09/21/1935.

According to CA voting records c. 1938, Onstad and his wife were registered Democrats. Harold Onstad was named to the Board of Trustees of the Reed Union School District in late 05/1951. (See "Reed School Asks for Contract Bids in 3 Week Period" Marin Daily Independent, 05/28/1951, p. 1.)