He was the son of James Coulter (d.1708) a prominent Glasgow merchant originally from
Dumfriesshire. John Coulter and estates in the West Indies cultivating sugar. The family also had tobacco plantations in
Virginia. When Coulter succeeded Andrew Ramsay as Lord Provost in 1736 the population of the city was just under 15,000 people. He owned the estate of Auchinraith near
Blantyre, originally called Whistleberry. The house was in the 18th century called The Grove and only later was called Auchinraith House. Aichinraith House was demolished and rebuilt in 1809. He died on 17 November 1747 in Glasgow. ==Family==