The Commemorative Order of St. Thomas of Acon is an invitational chivalric and Masonic order. In the United States of America, the Order is governed by the Grand Master’s Council, which warrants local Chapels of the Order. Chapels may be grouped in larger administrative units, known as Provinces, as needs require. The Grand Master’s Council meets annually, generally in conjunction with the Grand Council of the Allied Masonic Degrees for the United States of America.

A candidate for admission must be a subscribing Master Mason in a Craft Lodge in amity with the United Grand Lodge of England, a subscribing Royal Arch Mason in a Royal Arch Chapter, or its equivalent in other countries, in amity with Supreme Grand Chapter of England and a subscribing Knight Templar, or its equivalent in other countries, in amity with the United Religious, Military and Masonic Orders of the Temple and of St. John of Jerusalem, Palestine, Rhodes and Malta.

There is a province in the Northwestern United States which contains five (5) Chapels:  Tahoma Chapel No. 3, Federal Way WA; Cascade Chapel No. 20, Snohomish WA; Rocky Mountain Chapel No. 26, Denver CO; Intermountain Chapel No. 27, Boise ID, and Mt. Nebo No. 34, Salt Lake City UT.