- Machine Shop & Tool Repair Service, Amherst
- Machinery And Equipment Manufacturers, Amherst
- Machinery, Supplies & Equipment - Business Production Related, Amherst
- Machinery, Supplies & Equipment - Business Supplies Related, Amherst
- Mailbox Rental Services, Amherst
- Mailing, Delivery & Courier Service, Amherst
- Management Consultants & Services, Amherst
- Manifold Business Forms Manufacturers, Amherst
- Manufacturing, Amherst
- Manufacturing Products, Amherst
- Marine Electronic Equipment, Amherst
- Marine Supplies & Equipment, Amherst - Boat Supplies
- Martial Arts & Self Defense Schools, Amherst
- Massage Therapists & Professional, Amherst
- Massage Therapy, Amherst
- Men's Clothing Stores, Amherst - Clothes & Accessories
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- Metal Plating & Polishing, Amherst
- Mini & Self Storage, Amherst
- Miscellaneous Business Services, Amherst
- Miscellaneous Government, Amherst
- Miscellaneous Manufacturing, Amherst
- Miscellaneous Photographers, Amherst
- Miscellaneous Professional, Amherst
- Mortgage Bankers & Correspondents, Amherst
- Mortgages & Loans, Amherst
- Motor Vehicle, Amherst
- Motor Vehicle Rental & Leasing, Amherst
- Movie Theaters, Amherst
- Moving & Storage Supplies & Equipment, Amherst
- Moving Companies, Amherst
- Muffler Shop & Exhaust Systems, Amherst
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