| Potlatch | Lewiston | ID |
| Pulp Mill Warehouse | Lewiston | ID |
| Raft River Turbine Generating Station | Idaho Falls | ID |
| Ref Chem Engineering | Conda | ID |
| Robison Distributing | Scoville | ID |
| Rupert, Idaho Factory | Rupert | ID |
| Saint Alphonsus Hospital | Boise | ID |
| Scoville Naval Reactor Facility | Scoville | ID |
| Sego Milk Products | Buhl | ID |
| Sego Milk Products | Preston | ID |
| Simplot | Conda | ID |
| Simplot | Pocatello | ID |
| Snake River Dairyman's Association | Idaho Falls | ID |
| Southern Industries Piping | Idaho Falls | ID |
| Standard Mining | Wallace | ID |
| State Hospital South | Blackfoot | ID |
| Sugar Factory | Paul | ID |
| Sullivan Mining | Kellogg | ID |
| Terminal Ice & Cold Storage | Nampa | ID |
| Tiger & Poorman Mining | Burke | ID |
| Union Pacific Railroad | Sun Valley | ID |
| Union Pacific Railroad | Pocatello | ID |
| United States Atomic Energy Commission | Arco | ID |
| United States Atomic Energy Commission | Idaho Falls | ID |
| United States Bureau Of Reclamation | Boise | ID |
| United States Reclamation Service | Emmett | ID |
| University Of Idaho | Moscow | ID |
| Utah & Idaho Sugar | Idaho Falls | ID |
| Utah & Idaho Sugar | Shelley | ID |
| Utah & Idaho Sugar | Nampa | ID |
| Utah & Idaho Sugar | Blackfoot | ID |
| Utah & Idaho Sugar | Lincoln | ID |
| Waters Asbestos & Supply | Scoville | ID |
| Waters Asbestos & Supply | Idaho Falls | ID |
| Western Steel | Arco | ID |
| Westinghouse Electric & Manufacturing | Idaho Falls | ID |
| Westinghouse Electric & Manufacturing | Scoville | ID |
| Westvaco | Pocatello | ID |
| Yanke Machine Shop | Boise | ID |
| Zinn Industrial Supply | Lewiston | ID |
