- Machinery, Supplies & Equipment - Business Supplies Related, Monkton
- Major Appliances, Monkton - Household & Kitchen
- Management Consultants & Services, Monkton
- Manicurists & Pedicurists, Monkton
- Manufacturing, Monkton
- Manufacturing Products, Monkton
- Masonry Contractors, Monkton - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Monkton
- Massage Therapy, Monkton
- Medical & Health Service Organizations, Monkton
- Medical Research, Monkton
- Medical Research & Development, Monkton - Medical Information & Research
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- Methodist Church, Monkton
- Miscellaneous Government, Monkton
- Miscellaneous Personal Services, Monkton
- Mortgage Bankers & Correspondents, Monkton
- Mortgage Companies, Monkton
- Mortgage Contracts & Services, Monkton
- Mortgages Commercial & Industrial, Monkton
- Motion Pictures Video Tape Duplication & Transfer Services, Monkton
- Motor Vehicle, Monkton
- Mulch, Peat & Moss Products, Monkton
- Music Schools, Monkton
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