- Machine Shop & Tool Repair Service, Boylston
- Machine Shops Experimental, Boylston
- Machinery, Supplies & Equipment - Business Production Related, Boylston
- Machinery, Supplies & Equipment - Business Supplies Related, Boylston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Boylston
- Mailing, Delivery & Courier Service, Boylston
- Management Consultants & Services, Boylston
- Manufacturing, Boylston
- Membership Sports & Recreation Clubs, Boylston
- Mexican Restaurants, Boylston
- Mini & Self Storage, Boylston
- Miscellaneous Business Product Repair, Boylston
- Miscellaneous Household Item Repair, Boylston
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- Miscellaneous Personal Services, Boylston
- Modular & Mobile Homes For Sale, Boylston - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Boylston
- Motor Homes Renting & Leasing, Boylston
- Motor Vehicle, Boylston
- Motor Vehicle Rental & Leasing, Boylston
- Motorcycle & Motor Scooters Dealers, Repair & Service, Boylston
- Motorcycle Repair & Service, Boylston
- Moving Companies, Boylston
- Moving Truck Rental , Boylston
- Mulch, Peat & Moss Products, Boylston
- Museums, Boylston
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