- Machine Shop & Tool Repair Service, Sellersville
- Machinery And Equipment Manufacturers, Sellersville
- Machinery, Supplies & Equipment - Business Supplies Related, Sellersville
- Management Consultants & Services, Sellersville
- Manufacturers Agents & Representatives, Sellersville
- Manufacturers Representative, Sellersville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sellersville
- Manufacturing Products, Sellersville
- Marble, Sellersville
- Marble Contractors, Sellersville - Installation, Cleaning & Removal Services
- Marble Tile, Sellersville
- Marriage & Family Counselors, Sellersville
- Masonry Contractors, Sellersville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sellersville
- Massage Therapists & Professional, Sellersville
- Massage Therapy, Sellersville
- Meat Market, Wholesale & Products, Sellersville
- Medical Diagnostic Clinics, Sellersville - Clinical Labs & Centers
- Medical Research, Sellersville
- Medical Research & Development, Sellersville - Medical Information & Research
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- Medical Supplies & Equipment, Sellersville
- Membership Sports & Recreation Clubs, Sellersville
- Mental Health Specialists, Sellersville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Sellersville
- Metal Plating & Polishing, Sellersville
- Miscellaneous Business Product Repair, Sellersville
- Miscellaneous Agriculture, Sellersville
- Miscellaneous Government, Sellersville
- Miscellaneous Manufacturing, Sellersville
- Miscellaneous Professional, Sellersville
- Molds, Sellersville
- Mortgage Bankers & Correspondents, Sellersville
- Motor Vehicle, Sellersville
- Motor Vehicle Rental & Leasing, Sellersville
- Motorcycle Parts, Accessories & Dealers, Sellersville
- Moving Companies, Sellersville
- Moving Truck Rental , Sellersville
- Mulch, Peat & Moss Products, Sellersville
- Music, Sellersville
- Musical Instruments & Equipment Stores, Sellersville
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