| Union |
UM Campuses |
Missoula |
| International Brotherhood of Electrical Workers |
8 |
8 |
| Print, Publishing & Media Sector of the Communication Workers of America |
5 |
5 |
| Graphic Communication International Union |
10 |
10 |
| International Union of Operating Engineers (Heating Plant) |
19 |
5 |
| Montana District Council of Laborers |
11 |
11 |
| International Brotherhood of Carpenters and Joiners of America |
13 |
2 |
| Montana Public Employees Association |
950 |
839 |
| United Association of Plumbers and Pipefitters |
10 |
10 |
| International Union of Operating Engineers (Colleges of Technology) |
16 |
8 |
| Montana University System Maintenance Painters Union |
9 |
7 |
| International Association of Machinists and Aerospace Workers |
6 |
6 |