The 1880 US Census confirms Allen King was born in NC in 1800. He was living in Oak Grove, Wake, NC at the age of 80. His wife Susan was 70y in 1880. Daughters living with them at that time, were Candis 40y and Angeline 35. Everyone in this household was born in NC.
Son, Allen F. King died 22 June 1914 at Leeseville, Wake, NC where he is buried. Allen was born in Wake Co. as were his parents, Allen and Susan King. Cemetery was the Home Family Graveyard. Maybe Allen's parents were burried there as well.