[1] He was born in 1824 to George Eggborn (1796–1848) and his wife Amy Ann McQueen (1801–1835), who had moved to that area of Culpeper County two years earlier.
His elder brother Perry J. Eggborn had held the same General Assembly seat for two terms before the American Civil War.
Jacob Samuel Eggborn was the Culpeper County sheriff by 1860,and had real estate worth about $9000 and an equal amount of personal property.
[2] On December 11, 1884, the 59-year-old farmer married 27-year-old Ida Burgess in Culpeper, and they had a son George (1886 – after 1928) and another child Arney (1893–).
[3] Due to Eggborn's strong support of Republican Rutherford B. Hayes (who won the presidential election of 1876, defeating Democrat Samuel Tilden), a post office was established called Eggbornsville, Virginia, on August 22, 1877, at the Eggborn Brothers store.