John Cox was born, in Middletown, Monmouth County, New Jersey, British North America on 1 November 1727 and died in Lincolnton, Lincoln County, North Carolina, about the years 1804 or 1805. He was first married, in New Jersey, to Margaret Morris (1 October 1732 - 15 August 1799) and engendered the following children: Morris Cox, born 24 September 1753, in New Jersey, British North America, married Catherine Hutchinson (11 February 1754 - 14 July 1796) 21 June 1773, in New Jersey, and died 22 April 1804, in or near Lincolnton, North Carolina; Rebecca Cox, born 22 March 1755, in New Jersey, married Absalom Bonham (1739 - 1794), by license dated 8 April 1785, in North Carolina; Aaron Cox, Sr., born 2 October 1757, in New Jersey, married Olly Baker (1760/65 - AFT 1840), by license dated 4 January 1787, in Lincoln County, North Carolina, and died in Lincoln County, North Carolina; Mary Cox, born 14 October 1761, Middletown, New Jersey, British North America, married James Sullivan (1754 - 27 August 1825) about 1790, and died 15 December 1847, in Lincolnton, North Carolina; Paul Cox, born 14 July 1763, in New Jersey, and died in Spartanburg, South Carolina; Rachel Cox, born 3 September 1765, in New Jersey, British North America, married Peter Carson by license dated 5 July 1786, in North Carolina; Nancy Ann(e) Cox, born 19 August 1769, in New Jersey, British North America, married Moses Moore (29 November 1762 - 7 December 1832) by license dated 29 July 1785, in North Carolina, and died 6 September 1847; Elizabeth Cox, born 16 February 1769, in New Jersey, British North America, married Moses Hiram Ferguson (February 1762 - 1845) in 1785, in North Carolina, and died 1844, in Johnson County, Missouri; Elisha Cox, born 6 October 1771, in Lincoln County, North Carolina, British North America, married Margaret Holland (28 January 1774 - 31 Jan 1825) 19 December 1792 (Bible record), and died 28 January 1824, in Lincoln County, North Carolina; Susanna Cox, born 24 March 1773, Lincoln County, North Carolina, British North America, married Peter Carpenter (ABT 1762 - 1845) about 1790; and Elijah Cox, born 17 January 1775, in Lincoln County, North Carolina,British North America, married Jane Huggin(s) by license dated 8 December 1796, in North Carolina, and died in Murfreesboro, Tennessee. After the death of Margaret Morris, John Cox was second married to Mary Carpenter on 27 July 1800.
John Cox and his family migrated from Trenton, New Jersey, to Lincoln County, North Carolina, so it seems, about 1770. The Will of Thomas Saltar omits mention of Morris Cox.