| Business | Phone |
| Apollo Exploration/Devmnt Inc 704 E Michigan St, Mount Pleasant 48858 | (989) 773-2854 |
| Ausable Energy Llc 148 W Broomfield Rd, Mount Pleasant 48858 | (989) 773-1889 |
| Bhs Inc 1525 Airway Dr, Mount Pleasant 48858 | (989) 772-4500 |
| Federal Oil Co 704 E Michigan St, Mount Pleasant 48858 | (989) 773-9873 |
| Geo Star Corp 2480 W Campus Dr C, Mount Pleasant 48858 | (989) 773-7050 |
| Matrix Explorations 600 W Pickard St 102, Mount Pleasant 48858 | (989) 773-5158 |
| Merrill Drilling 702 E Michigan St, Mount Pleasant 48858 | (989) 773-7103 |
| Merrill Energy 702 E Michigan St, Mount Pleasant 48858 | (989) 775-3110 |
| Okemah Production Inc 1425 S Mission Rd, Mount Pleasant 48858 | (989) 772-2559 |
| Tolas Oil & Gas Exploration 306 E Broadway St, Mount Pleasant 48858 | (989) 773-9467 |