Data source is the pamphlet, "Genealogy of One Branch of the Jacob Mumma Family", written by Ellen Landis Mumma in 1970.
Listed in the Brubacher Genealogy in America, 1884, p. 195
http://ia700303.us.archive.org/33/items/brubachergenealo1884brub/brubachergenealo1884brub.pdf
It is unclear why Fanny moved to Derry Township. in the 1840 & 1850 census
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1840 Census, PA, Dauphin Co., Derry Twp., p. 200
Widow Muma, 1 male under 5, 1 male 5-9, 1 female under 5, 1 female 5-9, 1 female 15-20 (probable error in Widow Muma's age - should have been 20-30).
1850 Census, PA, Daupihin Co, Derry Twp., p. 133, 29 Aug 1850
Fanny Mumma, 41, b. PA
Elizabeth " , 19, b. PA
Fanny " , 13, b. PA
In the 1850 census, Jonas is living with the family of John Ruth (Rutt?), age 31 and his wife, Barbara and 3 children. He is only a few doors away from his uncles, Isaac and Martin. His brother, Christian is living with their uncle, Christian Mumma
In 1860, both Christian and Jonas are both living in East Hempfield township of Lancaster County. Chistian has a wife and children. Jonas is living next door as a farm laborer
1870 Census, Lancaster Co., East Hempfield,
Mumma, Jonas, 36, farmer, $37570 Real estate, $1724 personal, b. PA
" , Mary Ann, 28, keeping house, b. PA
" , Eli B., 8, b. PA
" , John B., 7, b. PA
" , Fannie B., 5, b. PA
" , Annie, 3, b. PA
" , Isaac B., 1, b. PA
Kemerle, Isiah, 16, Domestic Servant, b. PA
Miller, Harry, 12, domestic servant
1880 Census, PA, Lancaster, East Hempfield, ED 123, dwelling 10
Mumma, Jonas, 45, farmer, b: PA/PA/PA
" , Mary, 37, wife, keeping house, b: PA/PA/PA
" , Eli, 18, son, at home, b: PA/PA/PA
" , John, 17, son, at home, b: PA/PA/PA
" , Isaac, 11, son, at home, b: PA/PA/PA
" , Fannie, 14, dau, at home, b: PA/PA/PA
" , Annie, 12, dau, at home, b: PA/PA/PA
" , Ellen, 9, dau, at home, b: PA/PA/PA
1900 Census, PA, Lancaster, East Hempfield twp., Landisville, ED 30, dwelling 201
[Note: Jonas is one of 3 borders living in the household.
Newcomer, Christian, head, May 1836, 64, b: PA/PA/PA, bording house
" , Clara A., wife, June 1854, 45, m: 23 yrs, 0 children, 0 living, b: PA/PA/PA
Mumma, Jonas, Jan 1835, 65, b: PA/PA/PA, retired