You may have all the census but I did find this one. 1930 United States Federal Census Name: Uva W Johnson Home in 1930: Ridge Farm, Vermilion, Illinois Age: 29 Estimated Birth Year: abt 1901 Relation to Head of House: Son Father's Name: Nathaniel Mother's Name: Mary C Occupation: Parents' birthplace: Pennsylvania and Illinois Household Members: Name Age Nathaniel Johnson 69, church janitor Mary C Johnson 67 Uva W Johnson 29, retail salesman, petroleum products
This might possibly be him if he went by William. Social Security Death Index Name: William Johnson SSN: 495-56-0903 Last Residence: 65251Fulton, Callaway, Missouri, United States of America Born: 26 Oct 1901 Died: Apr 1976 State (Year) SSN issued: Missouri (1966 )
This is all I could find.Write to the county clerk and see if there is a death record there.