- Machinery And Equipment Manufacturers, Lancaster
- Mail Receiving & Forwarding Service, Lancaster
- Management Consultants & Services, Lancaster
- Manufactured & Mobile Home Movers & Transporting, Lancaster
- Manufacturing, Lancaster
- Manufacturing & Industrial Consultants, Lancaster
- Marketing Consultants Professional Practices, Lancaster
- Masonry Contractors, Lancaster - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lancaster
- Massage Therapists & Professional, Lancaster
- Massage Therapy, Lancaster
- Medical Groups & Clinics, Lancaster - Medical & Health Centers
- Medical Supplies & Equipment, Lancaster
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- Membership Sports & Recreation Clubs, Lancaster
- Mental Health Specialists, Lancaster - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Agriculture, Lancaster
- Miscellaneous Government, Lancaster
- Miscellaneous Personal Services, Lancaster
- Mortgage Bankers & Correspondents, Lancaster
- Motion Picture & Television Production Services, Lancaster
- Motor Vehicle, Lancaster
- Motor Vehicle Rental & Leasing, Lancaster
- Moving Truck Rental , Lancaster
- Mulch, Peat & Moss Products, Lancaster
- Multimedia Publishers, Lancaster - Multimedia Services & Systems
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