In the 1910 US Census for District 106, South Jacksonville, Jackson County, Oregon the family of William H. Barnum was enumerated as follows:
Dwelling #128; Family #128
Barnum, Wm. H.; Head; M; W; 26; 1st marriage; Married 3 years; b. New York; Father b. Canada-English; Mother b. Illinois; Speaks English; Treasurer; Railroad Company; Wage earner; Employed full census year; Can read and write; Owns non-farm home free of mortgage
Barnum, Jessie; Wife; F; W; 23; 1st marriage; Married 3 years; No children; b. Ohio; Father b. Ohio; Mother b. Pennsylvania; Speaks English; No occupation; Can read and write
Barnum, Wm. S.; Father; M; W; 52; 1st marriage; Married 32 years; b. Canada-English; Father b. Vermont; Mother b. Canada-English; Immigrated to US in 1885; Speaks English; President; Railroad Company; Wage earner; Employed full census year; Can read and write
Barnum, Bertha; Mother; F; W; 56; 1st marriage; Married 32 years; Mother of 4 children; 3 children living; b. Illinois; Parents' birthplaces unknown; Speaks English; No occupation; Can read and write
Barnum, Jno. C.; Brother; M; W; 30; Single; b. New York; Father b. Canada-English; Mother b. Illinois; Speaks English; Manager; Railroad Company; Wage earner; Employed full census year; Can read and write
Barnum, George A.; Brother; M; W; 19; Single; b. Oregon; Father b. Canada-English; Mother b. Illinois; Speaks English; Engineer; Railroad Company; Wage earner; Employed full census year; Can read and write
He died during the Great Influenza Epidemic of 1918.