台灣基督長老教會
On 30 June 2004, a large bust statue of Mackay was dedicated outside the Oxford County offices in Woodstock, Ontario. The delegation from Taiwan in attendance included representatives from Aletheia University and the Presbyterian Church in Taiwan. The event was also attended by representatives of the Presbyterian Church in Canada, the United Church of Canada, local, regional, and national Canadian dignitaries, and a number of Mackay descendants from across North America. One of his grandchildren is Dr. John Ross Mackay.