William King was born in 1704 in Capel, Surrey, the son of William King and his wife Sarah Constable. He was baptized on 7th January 1704 in St John the Baptist, Capel. He married Elizabeth Pooke on 1731 by Licence. A marriage licence was issued on 21st April 1731, granting permission for them to marry in either Capel or Dorking, however no corresponding record appears in either parish register so they may have been married elsewhere or the record may have been omitted from the relevant register. Elizabeth was born in 1712 in Chalton, Hampshire, the daughter of Henry Pooke and his wife Martha Biden. She was baptized on 12th February 1712 in the church of St Michael and All Angels, Chalton. William became the blacksmith in the nearby village of Newdigate, Surrey, whilst his father and brothers (and later his son Richard and son in law Henry Page) continued as blacksmiths in Capel.
William and Elizabeth had had 7 children, William, b. 1732, Elizabeth, b. 1734, Martha, b. 1736, Richard, b. 1738, Sarah, b. 1739, Henry, b. 1743 and Joseph, b. 1746.
William is mentioned in the will of his father, of 1735 and in the will of his brother Richard of 1753. He also appears in the Register of Duties Paid for Apprentices Indentures in 1737, taking on an apprentice named William Pinnion, for which he received £10 paying 5 shillings in duty.
William died in 1767 and was buried on 4th February 1767 in Capel, Surrey.