In the 1850 US Census for Boardman Township, Clayton, Iowa the family of Elihu Barnum was enumerated as follows:
Household #460; Family #460
Barnum, Elihue; 22; M; Farmer; Real property $400; b. Vermont
Barnum, Eloisa; 24; F; b. New York
Barnum, Russel E.; 3; M; b. Pennsylvania
Barnum, Arben J.; 1; M; b. Iowa
Barnum, Hiram; 10; M; b. Pennsylvania; attended school during previous year [Hiram was Elihu's brother; both were sons of Russell and Deborah (Palmer) Barnum].
In the 1900 US Census for District 221, Deep Creek, Woods County, Oklahoma Elihu and Eloise Barnum were enumerated with the family of their son John.
In the 1910 US Census for District 173, Deep Creek, Major County, Oklahoma Elihu Barnum (widowed and remarried) was enumerated as follows:
Dwelling #188; Family #190
Barnum, Elihu; Head; W; M; 82; Second marriage; Married 4 years; b. Vermont; Both parents b. Vermont; Speaks English; Farmer; Employed for own account; Can read and write; Owns farm home free of mortgage; Farm Schedule 171
Barnum, Lucinda; Wife; W; F; 62; Third marriage; Married 4 years; Mother of 4 children; 2 children living; b. Indiana; Father b. New York; Mother b. Ohio; Speaks English; No occupation; Can read and write
Bode, Robert; Boarder; M; W; 29; Single; b. Missouri; Father b. Germany; Mother b. Missouri; Speaks English; Farm hand; Wage earner; Can read and write