- Machinery, Supplies & Equipment - Business Production Related, Penfield
- Machinery, Supplies & Equipment - Business Supplies Related, Penfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Penfield
- Major Appliances, Penfield - Household & Kitchen
- Management Consultants & Services, Penfield
- Manicurists & Pedicurists, Penfield
- Manufacturers Agents & Representatives, Penfield
- Manufacturers Representative, Penfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Penfield
- Manufacturing & Industrial Consultants, Penfield
- Manufacturing Products, Penfield
- Manufacturing Services, Penfield
- Marriage & Family Counselors, Penfield
- Martial Arts & Self Defense Schools, Penfield
- Masonry Contractors, Penfield - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Penfield
- Massage Therapy, Penfield
- Medical & Health Service Organizations, Penfield
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- Medical Supplies & Equipment, Penfield
- Membership Sports & Recreation Clubs, Penfield
- Mental Health Clinics, Penfield - Treatment Centers
- Mental Health Specialists, Penfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Penfield
- Mexican Restaurants, Penfield
- Miscellaneous Business Services, Penfield
- Miscellaneous Government, Penfield
- Miscellaneous Manufacturing, Penfield
- Miscellaneous Professional, Penfield
- Mortgage Bankers & Correspondents, Penfield
- Mortgages & Loans, Penfield
- Motor Vehicle, Penfield
- Muffler Shop & Exhaust Systems, Penfield
- Music, Penfield
- Music Therapy, Penfield
- Musical Instruments & Equipment Stores, Penfield
- Musical Recording Services, Penfield
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