- Machine Shop & Tool Repair Service, Newtown Square
- Machinery Movers & Erectors, Newtown Square
- Machinery, Supplies & Equipment - Business Production Related, Newtown Square
- Machinery, Supplies & Equipment - Business Supplies Related, Newtown Square
- Mailbox Rental Services, Newtown Square
- Mailing, Delivery & Courier Service, Newtown Square
- Major Appliances, Newtown Square - Household & Kitchen
- Malls & Shopping Centers, Newtown Square
- Management Consultants & Services, Newtown Square
- Management Training & Development, Newtown Square
- Manicurists & Pedicurists, Newtown Square
- Manifold Business Forms Manufacturers, Newtown Square
- Manufacturers Agents & Representatives, Newtown Square
- Manufacturers Representative, Newtown Square - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Newtown Square
- Market Research & Analysis , Newtown Square - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Newtown Square
- Martial Arts & Self Defense Schools, Newtown Square
- Masonry Contractors, Newtown Square - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Newtown Square
- Massage Therapy, Newtown Square
- Meat Market, Wholesale & Products, Newtown Square
- Mechanical Engineer, Newtown Square - Mechanical Engineering Service
- Medical & Health Service Organizations, Newtown Square
- Medical & Infectious Waste Disposal, Newtown Square
- Medical Diagnostic Clinics, Newtown Square - Clinical Labs & Centers
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- Medical Groups & Clinics, Newtown Square - Medical & Health Centers
- Medical Supplies & Equipment, Newtown Square
- Membership Sports & Recreation Clubs, Newtown Square
- Men's Clothing Stores, Newtown Square - Clothes & Accessories
- Mental Health Specialists, Newtown Square - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Newtown Square
- Methodist Church, Newtown Square
- Middle Eastern Restaurants, Newtown Square
- Mini & Self Storage, Newtown Square
- Miscellaneous Household Item Repair, Newtown Square
- Miscellaneous Government, Newtown Square
- Miscellaneous Manufacturing, Newtown Square
- Miscellaneous Personal Services, Newtown Square
- Miscellaneous Photographers, Newtown Square
- Miscellaneous Professional, Newtown Square
- Mortgage Bankers & Correspondents, Newtown Square
- Mortgages & Loans, Newtown Square
- Motion Picture & Television Production Services, Newtown Square
- Motor Vehicle, Newtown Square
- Movie Theaters, Newtown Square
- Moving & Storage Supplies & Equipment, Newtown Square
- Muffler Shop & Exhaust Systems, Newtown Square
- Multimedia Publishers, Newtown Square - Multimedia Services & Systems
- Museums, Newtown Square
- Music, Newtown Square
- Musical Instruments & Equipment Stores, Newtown Square
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