- Machine Shop & Tool Repair Service, Frontenac
- Machinery, Supplies & Equipment - Business Supplies Related, Frontenac
- Manufacturing, Frontenac
- Manufacturing Products, Frontenac
- Manufacturing Services, Frontenac
- Massage Therapists & Professional, Frontenac
- Massage Therapy, Frontenac
- Meat Packers, Frontenac
- Medical Supplies & Equipment, Frontenac
- Membership Sports & Recreation Clubs, Frontenac
- Metal Buildings, Frontenac - Kits, Homes, Steel Buildings, etc
- Metal Distributors, Frontenac
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- Methodist Church, Frontenac
- Miscellaneous Government, Frontenac
- Miscellaneous Manufacturing, Frontenac
- Miscellaneous Personal Services, Frontenac
- Miscellaneous Professional, Frontenac
- Money Change Machines, Frontenac
- Motor Vehicle, Frontenac
- Motor Vehicle Rental & Leasing, Frontenac
- Motorcycle Parts, Accessories & Dealers, Frontenac
- Moving Supplies & Equipment Rental, Frontenac
- Moving Truck Rental , Frontenac
- Muffler Shop & Exhaust Systems, Frontenac
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