In the 1940 US Census for Ward 19, Rochester City, Monroe, New York, Harold was enumerated as a Head of Family. In the family group were included his mother, his brother John, his sister Ruth and several other family members.
United States Census, 1940. Ward 19, Rochester, Rochester City, Monroe, New York, United States:
Harold Barnum, Head, Male, 39, Single, b. New York
Catherine Barnum, Mother, Female, 75, b. New York
John C. Barnum, Brother, Male, 34, b. New York
Mildred I. Barnum, Sister-in-law, Female, 25, b. New York
Sharlean M. Barnum, Niece, Female, 4, b. New York
Gail C. Barnum, Niece, Female, 3, b. New York
Harold A. Barnum, Nephew, Male, 2, b. New York
Clifford Stark, Brother-in-law Male, 29, b. New York
Ruth L. Stark, Sister, Female, 28, b. New York