- Shane Gorder, Richland County Commissioner, MACo President (09/2019 – 09/2020)
- Doug Martens, Rosebud County Commissioner, MACo 1st Vice President (09/2019 – 09/2020)
- Carl Seilstad, Fergus County Commissioner, Appointed to fill MACo 2nd Vice President Position (09/2019 – 09/2020)
- Jim Hart, Madison County Commissioner, MACo Immediate Past President (09/2019 – 09/2020)
- Mike McGinley, Beaverhead County Commissioner, MACo Fiscal Officer (09/2019 – 09/2020)
- Greg Chilcott, Ravalli County Commissioner, Appointed to fill the Urban Representative Position (10/2019 – 09/2020)
- Steve Holton, Ravalli County Sheriff, Member County Sheriff (02/2019 – 02-2020)
The Board of Trustees consists of the MACo Executive Committee (President, 1st Vice President, 2nd Vice President, Immediate Past President, Fiscal Officer, and Urban Counties Representative) and a Member County Sheriff.