In the 1850 US Census for Brookfield, Fairfield County, Connecticut the family of Isaac C. Barnum was enumerated as follws:
Dwelling #147; Family #159
Isaac Barnum, 37, M, Hatter, b. Connecticut
Luana Barnum, 27, F, b. Connecticut
Grandison Barnum, 14, M, b. connecticut
Eunice E. Barnum, 10, F, b. Connecticut, Attended school within the year
Martha I. Barnum, 7, F, b. Connecticut, Attended school within the year
Caroline M. Barnum, 4, F, b. Connecticut
Henry C. Barnum, 1, M, b. Connecticut
Mary Barnum, 3/12, F, b. Connecticut
In the 1880 US Census for Bethel, Fairfield County, Connecticut the family of Isaac C. Barnum was enumerated as follws:
Dwelling #487; Family #594
Barnum, Isaac C.; W; M; 67; Married; Hat block maker; b. Connecticut; Both parents b. Connecticut
Barnum, Loana; W; F; 57; Wife; Married; Keeps house; b. Connecticut; Both parents b. Connecticut
Barnum, Charles; W; M; 20; Son; Married; Married within the census year; Worker hat factory; b. Connecticut; Both parents b. Connecticut
Barnum, Elizabeth; W; F; 21; Daughter-in-law; Married; Married within the census year; b. Connecticut; Both parents b. Germany
Sniffen, George; W; M; 10; Grandson; At school; Attended school within the year; b. Connecticut; Both parents b. Connecticut
His cause of death was listed as Pneumonia, certified by A. E. Barber, MD.