- Machinery, Supplies & Equipment - Business Supplies Related, Bridgehampton
- Mail Delivery Service, Bridgehampton
- Management Consultants & Services, Bridgehampton
- Manicurists & Pedicurists, Bridgehampton
- Manufacturing, Bridgehampton
- Marine Supplies & Equipment, Bridgehampton - Boat Supplies
- Masonry Materials & Supplies, Bridgehampton
- Massage Therapists & Professional, Bridgehampton
- Massage Therapy, Bridgehampton
- Meat Market, Wholesale & Products, Bridgehampton
- Medical Alert Systems, Bridgehampton - Medical Alarms - PERS
- Medical Supplies & Equipment, Bridgehampton
- Metal Repair Service & Blacksmith, Bridgehampton - Iron Works
- Metaphysical Churches, Bridgehampton
- Millwork Contractors, Bridgehampton
- Mini & Self Storage, Bridgehampton
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- Miscellaneous Government, Bridgehampton
- Miscellaneous Personal Services, Bridgehampton
- Miscellaneous Photographers, Bridgehampton
- Miscellaneous Professional, Bridgehampton
- Mortgage Bankers & Correspondents, Bridgehampton
- Mortgage Companies, Bridgehampton
- Motor Vehicle, Bridgehampton
- Motor Vehicle Rental & Leasing, Bridgehampton
- Moving Companies, Bridgehampton
- Moving Supplies & Equipment Rental, Bridgehampton
- Moving Truck Rental , Bridgehampton
- Museums, Bridgehampton
- Music, Bridgehampton
- Music Entertainment, Bridgehampton
- Musicians, Bands & Disc Jockeys, Bridgehampton
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