- Mike McGinley, Beaverhead County Commissioner, Chair: Elected to a 2-year term (09/2018 – 09/2020)
- Kevin Krausz, Custer County Commissioner, Vice Chair: Elected to a 4-year term (09/2016 – 09/2020
- Tom Berry, Musselshell County Commissioner: Elected to a 4-year term (09/2015 – 09/2019)
- Jerry Collins, Garfield County Commissioner: Elected to a 4-year term (09/2017 – 09/2021)
- Bill Barron, Lake County Commissioner: MACo Board, 1-year term (09/2018 – 09/2019)
- Joe Briggs, Cascade County Commissioner: MACo Board, 1-year term (09/2018 – 09/2019)
- Eric Bryson, MACo Executive Director: Trust Secretary
The Board of Trustees consists of the MACo President, 1st Vice President, and the MACo Executive Director or his/her designee, subject to the requirement that the President and 1st Vice President are from Counties which are members of the Trust. Four Trustees shall be elected by the Trust members at the Trust’s Annual meeting to four (4) year staggered terms.