- Machine Shop & Tool Repair Service, Chelsea
- Machinery, Supplies & Equipment - Business Production Related, Chelsea
- Machinery, Supplies & Equipment - Business Supplies Related, Chelsea
- Machinery, Supplies & Equipment - Construction & Contractor Related, Chelsea
- Mailing, Delivery & Courier Service, Chelsea
- Major Appliances, Chelsea - Household & Kitchen
- Management Consultants & Services, Chelsea
- Mandarin Restaurants, Chelsea
- Manicurists & Pedicurists, Chelsea
- Manufacturing, Chelsea
- Manufacturing Products, Chelsea
- Marble Contractors, Chelsea - Installation, Cleaning & Removal Services
- Marinas & Marina Services, Chelsea
- Marine Supplies & Equipment, Chelsea - Boat Supplies
- Marriage & Family Counselors, Chelsea
- Martial Arts & Self Defense Schools, Chelsea
- Masonry Contractors, Chelsea - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Chelsea
- Massage Therapy, Chelsea
- Meat Market, Wholesale & Products, Chelsea
- Mechanical Contractors, Chelsea - Install, Service & Repair
- Mechanical Engineer, Chelsea - Mechanical Engineering Service
- Medical & Dental Management, Chelsea
- Medical Identification Jewelry, Chelsea
- Medical Management & Business Administration Service, Chelsea
- Medical Supplies & Equipment, Chelsea
- Membership Sports & Recreation Clubs, Chelsea
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- Mental & Developmental Information & Referral Services, Chelsea
- Mental Health Specialists, Chelsea - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Chelsea
- Metal Plating & Polishing, Chelsea
- Metal Repair Service & Blacksmith, Chelsea - Iron Works
- Mexican Food, Chelsea
- Mexican Restaurants, Chelsea
- Micro Breweries, Chelsea
- Miscellaneous Household Item Repair, Chelsea
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Chelsea
- Miscellaneous Manufacturing, Chelsea
- Miscellaneous Personal Services, Chelsea
- Miscellaneous Photographers, Chelsea
- Miscellaneous Professional, Chelsea
- Modular Homes - Rentals & Leases, Chelsea
- Monuments, Tombstones, Markers & Memorials, Chelsea
- Mortgage Bankers & Correspondents, Chelsea
- Motion Picture Pre & Post Production Services, Chelsea
- Motor Vehicle, Chelsea
- Motor Vehicle Rental & Leasing, Chelsea
- Moving & Storage Supplies & Equipment, Chelsea
- Moving Companies, Chelsea
- Moving Truck Rental , Chelsea
- Multimedia Publishers, Chelsea - Multimedia Services & Systems
- Music, Chelsea
- Musical Instruments & Equipment Stores, Chelsea
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