- Machine Shop, Ballwin
- Machinery, Supplies & Equipment - Business Production Related, Ballwin
- Machinery, Supplies & Equipment - Business Supplies Related, Ballwin
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ballwin
- Mail Delivery Service, Ballwin
- Mailbox Rental Services, Ballwin
- Mailing, Delivery & Courier Service, Ballwin
- Major Appliances, Ballwin - Household & Kitchen
- Make Up & Cosmetics Application, Ballwin
- Malls & Shopping Centers, Ballwin
- Management Consultants & Services, Ballwin
- Manicurists & Pedicurists, Ballwin
- Manufacturers Agents & Representatives, Ballwin
- Manufacturers Representative, Ballwin - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ballwin
- Manufacturing Products, Ballwin
- Marble, Ballwin
- Marine Products And Services, Ballwin
- Marine Repair & Service Stations, Ballwin
- Marine Supplies & Equipment, Ballwin - Boat Supplies
- Marine Supplies & Equipment Repair, Ballwin - Boat Supplies & Equipment
- Market Research & Analysis , Ballwin - Market Analysis, Business & Economic Research
- Marketing Schools, Ballwin
- Marriage & Family Counselors, Ballwin
- Martial Arts & Self Defense Schools, Ballwin
- Masonry Contractors, Ballwin - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Ballwin
- Massage Therapists & Professional, Ballwin
- Massage Therapy, Ballwin
- Meat Market, Wholesale & Products, Ballwin
- Medical & Dental Management, Ballwin
- Medical & Health Service Organizations, Ballwin
- Medical Management & Business Administration Service, Ballwin
- Medical Supplies & Equipment, Ballwin
- Mediterranean Restaurants, Ballwin
- Membership Sports & Recreation Clubs, Ballwin
- Mental Health Specialists, Ballwin - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Ballwin
- Merchandising & Pricing Equipment, Ballwin
- Merle Norman Cosmetics, Ballwin
- Messianic Church, Ballwin
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- Metal Distributors, Ballwin
- Metal Repair Service & Blacksmith, Ballwin - Iron Works
- Methodist Church, Ballwin
- Mexican & Latin American Goods & Products Stores, Ballwin
- Mexican Restaurants, Ballwin
- Middle Eastern Restaurants, Ballwin
- Millwork Manufacturers, Ballwin
- Mini & Self Storage, Ballwin
- Ministries Church, Ballwin
- Mirrors, Ballwin - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Ballwin
- Miscellaneous Business Services, Ballwin
- Miscellaneous Government, Ballwin
- Miscellaneous Manufacturing, Ballwin
- Miscellaneous Personal Services, Ballwin
- Miscellaneous Photographers, Ballwin
- Miscellaneous Professional, Ballwin
- Mission Churches, Ballwin
- Mobile Home Contractors, Ballwin
- Mobile Home Improvements & Repairs, Ballwin
- Modular & Mobile Homes For Sale, Ballwin - Manufactured Homes Sale & Service
- Money Change Machines, Ballwin
- Mortgage Bankers & Correspondents, Ballwin
- Mortgages & Loans, Ballwin
- Mosques, Ballwin
- Motivational Speakers & Consultants, Ballwin - Speakers, Lectures & Seminars
- Motor Vehicle, Ballwin
- Motor Vehicle Rental & Leasing, Ballwin
- Motorcycle Parts, Accessories & Dealers, Ballwin
- Movie Advertising, Ballwin
- Moving & Storage Supplies & Equipment, Ballwin
- Moving Companies, Ballwin
- Moving Truck Rental , Ballwin
- Muffler Shop & Exhaust Systems, Ballwin
- Music, Ballwin
- Music Lessons, Ballwin
- Music Lessons - Instrumental, Ballwin
- Music Sheet, Ballwin
- Music Stores Retail, Ballwin
- Musical Instrument Rental, Ballwin - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Ballwin
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