Notes:
1900 Census, KS, Johnson Co., Olathe City, ED 102, dwelling 198
Mumma, Isaak, head, Mar 1852, 48, m: 11 yrs, b: OH/MD/MD, carpenter
Mumma, Sarah, wife, June 1851, 48, m: 11 yrs, 2 children, 1 living, b: PA/PA/PA
Mumma, Orville, son, May 1893, 7, b: KS/OH/PA
1910 Census, WA, Kittitas Co., Ellenburg City, p. 69, 312 N. Anderson St., dwelling 428
Mumma, Isaac J. H. head, 57, m1, 20 yrs, b: OH/MD/OH, farmer, general farm
" , Sallie J., wife, 58, m1 20 yrs, b: PA/PA/PA
" , Orville L., son, 17, single, b: KS/OH/PA, chauffer, Auto Company
Neither Henry nor Sarah are found in the 1920 census
1920 Census, WA, Kittitas Co, Menastash twp., ED 76, dwelling 27
Mumma, Orvile, head, owns, 26, b: KS/OH/PA, farmer, general farm
" , Tressie, wife, 25, b: MO/MO/MO
" , Deane Lynn, son, 2 6/12, b: WA/KS/MO
In 1930 Orville has married again. Still living in Kittitas Co.