- Machine Shop, Collinsville
- Machine Shop & Tool Repair Service, Collinsville
- Machinery, Supplies & Equipment - Business Production Related, Collinsville
- Machinery, Supplies & Equipment - Business Supplies Related, Collinsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Collinsville
- Mailing, Delivery & Courier Service, Collinsville
- Maintenance, Cleaning & Sanitation, Collinsville
- Major Appliances, Collinsville - Household & Kitchen
- Malls & Shopping Centers, Collinsville
- Management Consultants & Services, Collinsville
- Manicurists & Pedicurists, Collinsville
- Manifold Business Forms Manufacturers, Collinsville
- Manufacturers Agents & Representatives, Collinsville
- Manufacturers Representative, Collinsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Collinsville
- Marriage & Family Counselors, Collinsville
- Martial Arts & Self Defense Schools, Collinsville
- Masonry Contractors, Collinsville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Collinsville
- Massage Therapy, Collinsville
- Meat Market, Wholesale & Products, Collinsville
- Medical & Dental Management, Collinsville
- Medical Diagnostic Clinics, Collinsville - Clinical Labs & Centers
- Medical Supplies & Equipment, Collinsville
- Membership Sports & Recreation Clubs, Collinsville
- Mental Health Specialists, Collinsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Collinsville
- Methodist Church, Collinsville
- Mexican Restaurants, Collinsville
- Microfilm & Imaging Service, Equipment & Supplies , Collinsville
- Mini Golf Courses, Collinsville
- Mirrors, Collinsville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
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- Miscellaneous Business Product Repair, Collinsville
- Miscellaneous Household Item Repair, Collinsville
- Miscellaneous Business Services, Collinsville
- Miscellaneous Government, Collinsville
- Miscellaneous Manufacturing, Collinsville
- Miscellaneous Personal Services, Collinsville
- Miscellaneous Photographers, Collinsville
- Miscellaneous Professional, Collinsville
- Modular & Mobile Homes For Sale, Collinsville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Collinsville
- Mortgage Bankers & Correspondents, Collinsville
- Mortgage Companies, Collinsville
- Mortgage Contracts & Services, Collinsville
- Mortgages & Loans, Collinsville
- Mosquito Control, Collinsville
- Motion Picture Pre & Post Production Services, Collinsville
- Motor Vehicle, Collinsville
- Motor Vehicle Rental & Leasing, Collinsville
- Motorcycle Parts, Accessories & Dealers, Collinsville
- Moving & Storage Supplies & Equipment, Collinsville
- Moving Supplies & Equipment Rental, Collinsville
- Moving Truck Rental , Collinsville
- Muffler Shop & Exhaust Systems, Collinsville
- Municipal Supplies, Collinsville
- Museums, Collinsville
- Music, Collinsville
- Music Lessons, Collinsville
- Music Lessons - Instrumental, Collinsville
- Music Schools, Collinsville
- Musical Instrument Rental, Collinsville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Collinsville
- Musical Instruments Repair, Sales & Service, Collinsville
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