In the 1840 US Census for Onondaga, Onondaga County, New York, the family of Marcellus Barnum was enumerated as follows:
Marcellus Barnum, 1 free white male of 10-15, 1 free white male of 30-40, 1 free white female of 20-30
In the 1850 US Census for Metomen, Fond du Lac County, Wisconsin the family of Marcellus Barnum was enumerated as follows:
Dwelling #1360; Family #1379
Marcellus Barnum, 41, M, Farmer, Real property $800, b. New York
Alvira J. Barnum, 35, F, b. New York
John Danum, 14, M, b. England
Electi Judd, 63, F, b. Connecticut
Matilda Raymonds, 4, F, b. Connecticut
In the 1860 US Census for Metomen, Fond du Lac County, Wisconsin the family of Marcellus Barnum was enumerated as follows:
Dwelling #18; Family #19
Marcellus Barnum, 50, M, Clergyman W. M., Real property $2,700, Personal property $729, b. New York
Alvira J. Barnum, 46, F, b. New York
Nelly Pelo, 13, F, b. New York, Attended school within the census year
James Barnum, 6, M, b. Wisconsin, Attended school within the census year
Harlow Law, 5, M, b. Wisconsin, Attended school within the census year
In the 1880 US Census for District 120, Cortlandville, Cortland County, New York, the family of Marcellus Barnum was enumerated as follows:
Dwelling #98; Family #106
Barnum, Marcellus; W; M; 70; Married; Farmer & minister; b. Connecticut; Both parents b. Connecticut
Barnum, Nancy; W; F; 59; Wife; Married; Housekeeping; b. Pennsylvania; Both parents b. Pennsylvania
Barnum, John M.; W; M; 7; Son; Single; At school; Attended school within the census year; b. Wisconsin; Father b. Connecticut; Mother b. Pennsylvania