Notes:
Some of this information came from the files of Stella Mumma
1880 Census PA, Dauphin Co., Steelton Borough, 3rd June 1880
Mumma, Isaac, 38, married, laborer, b. PA/PA/PA
" , Ida, 25, wife, keeps home, b. PA/PA/PA
" , Sally, 4, dau, b. PA
" , Joseph, 2, son, b. PA
" , Jacob, 8/12, son, b. PA
1900 Census PA, Dauphin Co, Steelton Borough, ED 104, p. 128
Mumma, Isaac, head, Dec 1847, 52, m. 25 yrs, b. PA occ - ?
" , Ida M., wife, Apr 1856, 44, m. 25 yrs, 6 children 6 living, b. PA/PA/PA
" , Jacob B, son, Oct 1879, 20, single, b. PA/PA/PA, occ - ?
" , Blanche, dau, Mar 1885, 15, single, b. PA at school
" , Isaac I, son, June 1888, 11, single, b. PA at school
" , John S, son, Oct 1895, 4, single, b. PA
Name is spelled as MUMMA in the 1910 census.
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1910 Census PA, Dauphin Co., Harrisburg City, ED 94, p. 109
Mumma, Isaac, head, 62, m1 35 yrs, b. PA/PA/PA laborer boiler shop
" , Ida S., wife, 54, m1 35 yrs, 6 children 6 living, b. PA/PA/PA
" , John S., son, 14, single, b. PA
1920 Census PA Dauphin Co., Harrisburg, 2nd Pct., ED109 p. 254
Mumma, Isaac, head, owns, 71, b. PA/PA/PA watchman in factory
" , Ida, wife, 63, b. PA/PA/PA
" , John, son, 24, single, b. PA tire inspector railroad