Martha was mentioned in the 26 February 1826 will of her father, James Hunter, proved 20 March 1826. [Essex County, Virginia, Will Book 20, pages 359–361.]

1850 U.S. Census, Essex County, Virginia
Page 80A, Dwelling 244, Family 244
Hunter, Robert M. T., 43, male, farmer, $50,000 real estate, born in Virginia
Hunter, Mary, 41, female, born in Virginia
Hunter, Martha, 40, female, born in Virginia
Hunter, Jane, 38, female, born in Virginia
Hunter, Sarah, 35, female, $3,700 real estate, born in Virginia
Hunter, Robert, 15, male, born in Virginia, attended school
Hunter, Martha, 10, female, born in Virginia, attended school
Hunter, James, 8, male, born in Virginia, attended school
Hunter, Sarah, 6, female, born in Virginia, attended school
Hunter, Patrick, 4, male, born in Virginia
Hunter, Muscoe, 2, male, born in Virginia
Garnett, Maria, 52, female, born in Virginia
Garnett, Muscoe R., 28, male, $25,000 real estate, born in Virginia
Burch, William, 30, male, manager, born in Virginia