- Machine Shop & Tool Repair Service, North Wales
- Machinery, Supplies & Equipment - Business Production Related, North Wales
- Machinery, Supplies & Equipment - Business Supplies Related, North Wales
- Machinery, Supplies & Equipment - Construction & Contractor Related, North Wales
- Magazine & Newspaper Stands, North Wales - Dealers & Distributors
- Mailing List Service, Brokers & Compilers, North Wales
- Maintenance, Cleaning & Sanitation, North Wales
- Make Up & Cosmetics Application, North Wales
- Malls & Shopping Centers, North Wales
- Management Consultants & Services, North Wales
- Manicurists & Pedicurists, North Wales
- Manufacturers Agents & Representatives, North Wales
- Manufacturers Representative, North Wales - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, North Wales
- Manufacturing & Industrial Consultants, North Wales
- Manufacturing Equipment & Supplies, North Wales
- Manufacturing Products, North Wales
- Market Research & Analysis , North Wales - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, North Wales
- Martial Arts & Self Defense Schools, North Wales
- Masonry Contractors, North Wales - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, North Wales
- Massage Therapy, North Wales
- Maternity Clothes & Clothing Stores, North Wales - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, North Wales
- Mechanical Engineer, North Wales - Mechanical Engineering Service
- Medical Billing Services, North Wales
- Medical Diagnostic Clinics, North Wales - Clinical Labs & Centers
- Medical Supplies & Equipment, North Wales
- Men's & Boys Clothing & Accessories Stores, North Wales
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- Men's Clothing Stores, North Wales - Clothes & Accessories
- Mental Health Specialists, North Wales - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Plating & Polishing, North Wales
- Metal Repair Service & Blacksmith, North Wales - Iron Works
- Metal Specialties, North Wales
- Methodist Church, North Wales
- Mexican Restaurants, North Wales
- Middle Eastern Restaurants, North Wales
- Military Supplies, North Wales
- Mini & Self Storage, North Wales
- Miscellaneous Household Item Repair, North Wales
- Miscellaneous Government, North Wales
- Miscellaneous Manufacturing, North Wales
- Miscellaneous Personal Services, North Wales
- Miscellaneous Photographers, North Wales
- Miscellaneous Professional, North Wales
- Mission Churches, North Wales
- Mobile Communications 2 Way Radios Sales & Service, North Wales
- Mortgage Bankers & Correspondents, North Wales
- Motor Vehicle, North Wales
- Movie Theaters, North Wales
- Moving & Storage Supplies & Equipment, North Wales
- Moving Companies, North Wales
- Muffler Shop & Exhaust Systems, North Wales
- Mulch, Peat & Moss Products, North Wales
- Museums, North Wales
- Music, North Wales
- Musical Instrument Rental, North Wales - Band & Orchestra Instruments
- Musical Recording Services, North Wales
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