- Machine Shop & Tool Repair Service, Belleville
- Machinery And Equipment Manufacturers, Belleville
- Machinery, Supplies & Equipment - Business Production Related, Belleville
- Machinery, Supplies & Equipment - Business Supplies Related, Belleville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Belleville
- Mailbox Rental Services, Belleville
- Mailing, Delivery & Courier Service, Belleville
- Major Appliances, Belleville - Household & Kitchen
- Management Consultants & Services, Belleville
- Manicurists & Pedicurists, Belleville
- Manifold Business Forms Manufacturers, Belleville
- Manufacturers Agents & Representatives, Belleville
- Manufacturers Representative, Belleville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Belleville
- Manufacturing & Industrial Consultants, Belleville
- Manufacturing Products, Belleville
- Marine Salvage & Wrecking Services, Belleville
- Markets & Grocers Equipment, Belleville
- Marriage & Family Counselors, Belleville
- Martial Arts & Self Defense Schools, Belleville
- Masonry Contractors, Belleville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Belleville
- Massage Therapy, Belleville
- Mats & Matting, Belleville
- Meat Market, Wholesale & Products, Belleville
- Mechanical Contractors, Belleville - Install, Service & Repair
- Medical Diagnostic Clinics, Belleville - Clinical Labs & Centers
- Medical Identification Jewelry, Belleville
- Medical Supplies & Equipment, Belleville
- Medical Transcription Service, Belleville
- Membership Sports & Recreation Clubs, Belleville
- Men's Clothing Stores, Belleville - Clothes & Accessories
- Mental Health Specialists, Belleville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Belleville
- Metal Pigment & Paint Products, Belleville
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- Metal Plating & Polishing, Belleville
- Metal Repair Service & Blacksmith, Belleville - Iron Works
- Metal Specialties, Belleville
- Metal Working Machinery, Belleville
- Methodist Church, Belleville
- Mexican Restaurants, Belleville
- Military Supplies, Belleville
- Millwork Contractors, Belleville
- Mini & Self Storage, Belleville
- Ministries Church, Belleville
- Mirrors, Belleville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Belleville
- Miscellaneous Household Item Repair, Belleville
- Miscellaneous Agriculture, Belleville
- Miscellaneous Business Services, Belleville
- Miscellaneous Government, Belleville
- Miscellaneous Industry, Belleville
- Miscellaneous Manufacturing, Belleville
- Miscellaneous Personal Services, Belleville
- Miscellaneous Professional, Belleville
- Modular & Mobile Homes For Sale, Belleville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Belleville
- Motion Picture Pre & Post Production Services, Belleville
- Motor Vehicle, Belleville
- Motor Vehicle Rental & Leasing, Belleville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Belleville
- Motorcycle Parts, Accessories & Dealers, Belleville
- Motorcycle Repair & Service, Belleville
- Moving & Storage Supplies & Equipment, Belleville
- Moving Companies, Belleville
- Moving Supplies & Equipment Rental, Belleville
- Moving Truck Rental , Belleville
- Music, Belleville
- Music Lessons, Belleville
- Music Lessons - Instrumental, Belleville
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