In the 1870 US Census for Danbury, Fairfield County, Connecticut the family of Grandison Barnum was enumerated as follows:
Dwelling #339; Family #380
Barnum, Grandison A.; 34; M; W; Hatter; Real property $500; b. Connecticut; Male citizen of US of 21 years of age and upwards
Barnum, Winfid J.; 26; F; W; Keeping house; b. New York
Barnum, Mattie L.; 5; F; W; b. Connecticut
Barnum, Emily A.; 2; F; W; b. Connecticut
Barnum, Jennie F.; 7/12; F; W; b. Connecticut; b. Oct.
In the 1880 US Census for District 113, Danbury, Fairfield County, Connecticut (Highland Street) the family of Grandison Barnum was enumerated as follows:
Dwelling #106; Family #122
Barnum, Grandison; W; M; 45; Husband; Married; Hat factory; Unemployed 2 months during the census year; b. Connecticut; Both parents b. Ireland
Barnum, Winetta; W; F; 37; Wife; Married; Keeping house; b. Ireland; Both parents b. Ireland
Barnum, Mattie; W; F; 16; Daughter; Single; At school; Attended school within the census year; b. Connecticut; Both parents b. Ireland
Barnum, Emma T.; W; F; 13; Daughter; Single; At school; Attended school within the census year; b. Connecticut; Both parents b. Connecticut
Barnum, Jennie F.; W; F; 11 Daughter; Single; At school; Attended school within the census year; b. Connecticut; Both parents b. Connecticut
Barnum, Saml C.; W; M; 9; Son; Single; At school; Attended school within the census year; b. Connecticut; Both parents b. Connecticut
Barnum, Susie S.; W; F; 6; Daughter; Single; At school; Attended school within the census year; b. Connecticut; Both parents b. Connecticut
Barnum, Mamie I.; W; F; 4; Daughter; Single; At school; b. Connecticut; Both parents b. Connecticut
Barnum, Grandison A.; W; M; 2; Son; Single; At school; b. Connecticut; Both parents b. Connecticut
[N.B., The birthplace of Ireland given for Winnie, her parents and the parents of Grandison does not match the 1870 census data and appears to be an error by the enumerator. The confusion seems to have originated with the birthplace of Ireland given for Maggie Freil, enumerated with the family living next door]