- Machine Shop & Tool Repair Service, East Hampton
- Machinery, Supplies & Equipment - Business Production Related, East Hampton
- Machinery, Supplies & Equipment - Business Supplies Related, East Hampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Hampton
- Magazine & Newspaper Stands, East Hampton - Dealers & Distributors
- Mailbox Rental Services, East Hampton
- Mailing, Delivery & Courier Service, East Hampton
- Maintenance, Cleaning & Sanitation, East Hampton
- Major Appliances, East Hampton - Household & Kitchen
- Management Consultants & Services, East Hampton
- Manicurists & Pedicurists, East Hampton
- Manufacturing, East Hampton
- Manufacturing Products, East Hampton
- Marinas & Marina Services, East Hampton
- Marriage & Family Counselors, East Hampton
- Martial Arts & Self Defense Schools, East Hampton
- Masonry Contractors, East Hampton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, East Hampton
- Massage Therapists & Professional, East Hampton
- Massage Therapy, East Hampton
- Material Handling & Heavy Machinery & Equipment, East Hampton
- Meat Market, Wholesale & Products, East Hampton
- Medical Diagnostic Clinics, East Hampton - Clinical Labs & Centers
- Medical Supplies & Equipment, East Hampton
- Membership Sports & Recreation Clubs, East Hampton
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- Men's Clothing Stores, East Hampton - Clothes & Accessories
- Mental Health Specialists, East Hampton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, East Hampton - Iron Works
- Metal Specialties, East Hampton
- Methodist Church, East Hampton
- Mexican Restaurants, East Hampton
- Mildew Removal & Control, East Hampton - Mold Removal
- Mini & Self Storage, East Hampton
- Mirrors, East Hampton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, East Hampton
- Miscellaneous Agriculture, East Hampton
- Miscellaneous Government, East Hampton
- Miscellaneous Professional, East Hampton
- Mobile Home Parks & Communities , East Hampton
- Money Transfer Service, East Hampton
- Mortgage Bankers & Correspondents, East Hampton
- Motion Picture Pre & Post Production Services, East Hampton
- Motor Vehicle, East Hampton
- Motor Vehicle Rental & Leasing, East Hampton
- Movie Theaters, East Hampton
- Moving & Storage Supplies & Equipment, East Hampton
- Moving Companies, East Hampton
- Moving Truck Rental , East Hampton
- Museums, East Hampton
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