- Machine Shop & Tool Repair Service, Niantic
- Machinery, Supplies & Equipment - Construction & Contractor Related, Niantic
- Make Up & Cosmetics Application, Niantic
- Management Consultants & Services, Niantic
- Manicurists & Pedicurists, Niantic
- Manufacturing, Niantic
- Marinas & Marina Services, Niantic
- Marine Supplies & Equipment, Niantic - Boat Supplies
- Marriage & Family Counselors, Niantic
- Martial Arts & Self Defense Schools, Niantic
- Masonry Materials & Supplies, Niantic
- Massage Therapy, Niantic
- Medical Supplies & Equipment, Niantic
- Membership Sports & Recreation Clubs, Niantic
- Mexican Restaurants, Niantic
- Milk Bars, Niantic
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- Mini & Self Storage, Niantic
- Miscellaneous Personal Services, Niantic
- Miscellaneous Professional, Niantic
- Modular & Mobile Homes For Sale, Niantic - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Niantic
- Mosquito Control, Niantic
- Motor Vehicle, Niantic
- Motor Vehicle Rental & Leasing, Niantic
- Motorcycle Parts, Accessories & Dealers, Niantic
- Movie Theaters, Niantic
- Moving Supplies & Equipment Rental, Niantic
- Moving Truck Rental , Niantic
- Muffler Shop & Exhaust Systems, Niantic
- Museums, Niantic
- Music, Niantic
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