He graduated from Vassar High School, Vassar, Michigan, in 1933 and continued his education in the Civilian Conservation Corps, 1933–1935. He took special educational courses and was employed in the automobile industry in Pontiac, 1936–1952.
Farnum was a deputy chairman of the Democratic National Committee from 1967 to 1968 and a member of the Waterford Board of Education from 1969 to 1970. He owned a financial and management consulting firm. He was elected secretary of the Michigan Senate in 1975 and served in that capacity until his death in Lansing. He was entombed in a mausoleum at Deepdale Memorial Park.
Legacy
The Michigan Senate's previous office building in Lansing was named after Farnum. In 2016, the Michigan Senate's office building was moved to the Connie Binsfield Building.