| Business | Phone |
| C J Engineering Concepts 1244 S Wilson St, Casper 82601 | (307) 265-5702 |
| Mountain West Engineering 1043 Cardiff, Casper 82609 | (307) 234-6001 |
| Wind River Mining & Engrg 781 N Foster Rd, Casper 82601 | (307) 234-5400 |
| Sinclair Little Amer Refinery 5700 E U S Hwy 20-26, Casper 82601 | (307) 232-2400 |