Sarah Cooper (born 1803, Maryland), was an Orthodox Friend, the daughter of Nicholas and Sarah (Balderston) Cooper. She moved to Belmont County, Ohio, in 1832, where she was a member of Flushing Monthly Meeting. In 1837 she married Joseph F. Garretson (ca. 1812-1840) and second, in 1846, John Michener (1785-1872). She died after 1880. All of the letters predate her marriages.