Welcome to the Montana / Wyoming State Pipe Trades Association Home Page. Our Association is comprised of three Local Unions in Montana and one Local Union in Wyoming: Local #30-Billings, Montana; Local #41-Butte, Montana; Local #459-Missoula, Montana; and Local #192-Cheyenne, Wyoming. The jurisdictional area of the two states covers over 240, 000 square miles. It is easy to understand where the ...