- Machine Shop & Tool Repair Service, Alton
- Machine Tools , Alton
- Machinery And Equipment Manufacturers, Alton
- Machinery, Supplies & Equipment - Business Production Related, Alton
- Machinery, Supplies & Equipment - Business Supplies Related, Alton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Alton
- Major Appliances, Alton - Household & Kitchen
- Malls & Shopping Centers, Alton
- Management Consultants & Services, Alton
- Manicurists & Pedicurists, Alton
- Manufacturing, Alton
- Manufacturing Products, Alton
- Marinas & Marina Services, Alton
- Marketing Schools, Alton
- Marriage & Family Counselors, Alton
- Martial Arts & Self Defense Schools, Alton
- Masonry Materials & Supplies, Alton
- Massage Therapists & Professional, Alton
- Massage Therapy, Alton
- Mastectomy Apparel, Forms, Prostheses & Supplies, Alton
- Medical & Dental Management, Alton
- Medical Diagnostic Clinics, Alton - Clinical Labs & Centers
- Medical Equipment Manufacturers, Alton
- Medical Groups & Clinics, Alton - Medical & Health Centers
- Medical Management & Business Administration Service, Alton
- Medical Supplies & Equipment, Alton
- Mental Health Specialists, Alton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Alton
- Merle Norman Cosmetics, Alton
- Metal Coating & Allied Services, Alton
- Metal Cutting Services, Alton
- Metal Repair Service & Blacksmith, Alton - Iron Works
- Metal Working Machinery, Alton
- Metaphysical Churches, Alton
- Methodist Church, Alton
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- Metropolitan Church, Alton
- Mexican Restaurants, Alton
- Mini & Self Storage, Alton
- Mining, Alton
- Mirrors, Alton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Alton
- Miscellaneous Government, Alton
- Miscellaneous Industry, Alton
- Miscellaneous Personal Services, Alton
- Miscellaneous Photographers, Alton
- Miscellaneous Professional, Alton
- Mission Churches, Alton
- Modular & Mobile Homes For Sale, Alton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Alton
- Mortgage Bankers & Correspondents, Alton
- Mortgage Companies, Alton
- Mortgages & Loans, Alton
- Mosquito Control, Alton
- Motion Picture Pre & Post Production Services, Alton
- Motor Vehicle, Alton
- Motor Vehicle Rental & Leasing, Alton
- Motorcycle & ATV Repair & Service, Alton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Alton
- Motorcycle Parts, Accessories & Dealers, Alton
- Motorcycle Repair & Service, Alton
- Moving Supplies & Equipment Rental, Alton
- Moving Truck Rental , Alton
- Muffler Shop & Exhaust Systems, Alton
- Museums, Alton
- Music, Alton
- Music Lessons, Alton
- Music Lessons - Instrumental, Alton
- Musical Instrument Rental, Alton - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Alton
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