- Machine Shop & Tool Repair Service, Dorchester
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dorchester
- Management Consultants & Services, Dorchester
- Manufacturing, Dorchester
- Manufacturing Products, Dorchester
- Masonry Materials & Supplies, Dorchester
- Massage Therapists & Professional, Dorchester
- Massage Therapy, Dorchester
- Membership Sports & Recreation Clubs, Dorchester
- Merchandise Sales Events, Dorchester
- Metal Buildings, Dorchester - Kits, Homes, Steel Buildings, etc
- Metal Roll Forming Manufacturers, Dorchester
- Minerals, Dorchester
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- Miscellaneous Agriculture, Dorchester
- Miscellaneous Government, Dorchester
- Miscellaneous Industry, Dorchester
- Miscellaneous Metal Work Manufacturers, Dorchester
- Miscellaneous Personal Services, Dorchester
- Miscellaneous Professional, Dorchester
- Mission Churches, Dorchester
- Mobile Home Parks & Communities , Dorchester
- Mortgage Bankers & Correspondents, Dorchester
- Motor Vehicle, Dorchester
- Motor Vehicle Rental & Leasing, Dorchester
- Motorcycle Parts, Accessories & Dealers, Dorchester
- Moving Truck Rental , Dorchester
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