Notes:
Her record of birth or baptism is not recorded in the First Reformed Church of Baltimore records.
Catharine and George Mason are found in the 1840 census of Baltimore in the 2rd district living next to her brother, John Mumma. The first 3 of their children are recorded, but there is an additional male and female in the household, the same age bracket as Catharine and George. The female is likely her sister, Ann.
1850 Census, MD, Baltimore, 12th district, p. 100, dwelling 1331
George Mason, 50, farmer, b: MD
Catharine " , 52, b: MD
Jos. " , 14, b: MD
Carvil " , 10, b: MD
Catharine " , 8, b: MD
Ann Mumma, 53, b: MD
1860 Census, MD, Baltimore, 12th district., p. 104
--- dwelling 705, family 709 ---
George Mason, 65, - no occp - , $2500 real estate, $800 personal, b: MD
Catharine " , 62, b: MD
Joseph " , 23, farm laborer, b: MD
Carvil " , 20, farm laborer, b: MD
Catharine " , 17, b: MD
Nancy Mummy, 60, b: MD <== Catharine's unmarried sister
Jacob Mason, 70, b: MD
Jacob Ross, 72, farm laborer, b: MD
---- dwelling 706, family 710 ---
Ann Mummy, 60, farmeress, $500 real estate, $100 personnal, b: MD
Joshua " , 39, farm hand, b: MD
Elizabeth " , 25, b: MD
--- dwelling 707, family 711 ---
John Mummy, 68, farmer, $3000 real estate, $600 personal, b: MD
Ann " , 60, b: MD
---dwelling 707, family 712 ---
John T. Mummy, 33, farm hand, married within the yr.
Sarah " , 23, b: MD
Catharine " , 2/12, b: MD
Margaret " , 24, b: MD (note: sister of John T. Mumma)
George " , 6, b: MD (note: child born to John T. Mumma from 1st marriage)
John Gross, 18, farm laborer, b: MD
Elijah Jones, 14, black, b: MD
1870 Census, MD, Baltimore, 12th District, dwelling 978 & 979
Mason, Catharine, 62, keeps house, $2000 real estate, $125 personal, b: MD
" , Virginia, 26, seamstress, b: MD
Mason, Joseph, 33, gardener, $4000 real estate, $500 personal, b: MD
" , Catherine, 30, keeps house, b. MD
" , George, 4, b: MD
[+ 4 other people who are workers in the garden, all born in Germany]
1880 Census, MD, Baltimore, 12th District, dwelling 333
Mason, Catharine, 83, widowed, gardener, b: MD/MD/MD
" , J. Thomas, 42, widowed, son, gardener, b: MD/MD/MD
" , Carville, 40, son, married, gardener, b: MD/MD/MD
" , Georganna, 31, dau in law, married, keeping house, b: MD/MD/MD
" , George Arthur, 14, grand son, at school, b: MD/MD/MD
" , Carville S., 10, grand son, b: MD/MD/MD
" , Wesley W., 1, grand son, b: MD/MD/MD
" , Virginia C., 35, dau, b: MD/MD/MD
" , Robert F., 1, grand son, b: MD/MD/MD
Jackson, John, black, servant, farm hand, b: MD/MD/MD
Catharine and George Mason are mentioned in a writeup for their son, Benjamin. "Biographical History of Northern CA", page 350
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"Benjamin D. Mason was born in Baltimore, MD, March 1, 1834, son of George and Catherine (Mumma) Mason. In 1852 he came on the steamer, 'Prometheus' via Nicaragua to CA. He married Elizabeth Zimmerman, a native of IN (parents native of PA) in Placerville, 19 Jan 1875. He died at age 75 in El Dorado County, 28 Dec 1908. Elizabeth Mason died age 79 in El Dorado County Apr 26 1922."