Dynion Mwyn has grown to be an international religious movement. In the United States, There are two branches of Dynion Mwyn in the United States. The Celtic Church of Dynion Mwyn, Inc. and the Church of Y Tylwyth Teg, Inc. The Association of Cymry Wiccae, Inc., a association of Dynion Mwyn covens, groves and churches, originally received an IRS Group 501(c)3 nonprofit exemption designation in 1976, and the Church of Y Tylwyth Teg was incorporated as a church on February 2, 1977. YTT and Dynion Mwyn has numerous sister covens throughout the United States, Africa, Australia and Western Europe including Great Britain.
The Tradition is organized around an Inner and Outer Circle, with the Outer Circle representing those members who are studying for initiation and the Inner Circle which is composed of Initiated Witches. Dynion Mwyn covens and churches have resident classes available in Wales and correspondence study courses available in the U.S.