- Machine Shop & Tool Repair Service, Richboro
- Machinery, Supplies & Equipment - Business Production Related, Richboro
- Machinery, Supplies & Equipment - Business Supplies Related, Richboro
- Major Appliances, Richboro - Household & Kitchen
- Management Consultants & Services, Richboro
- Manicurists & Pedicurists, Richboro
- Manufacturers Agents & Representatives, Richboro
- Manufacturers Representative, Richboro - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Richboro
- Marriage & Family Counselors, Richboro
- Martial Arts & Self Defense Schools, Richboro
- Medical & Health Service Organizations, Richboro
- Medical Supplies & Equipment, Richboro
- Membership Sports & Recreation Clubs, Richboro
- Mental Health Specialists, Richboro - Psychologist, Psychiatrist, Psychotherapist, etc
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- Miscellaneous Household Item Repair, Richboro
- Miscellaneous Government, Richboro
- Miscellaneous Manufacturing, Richboro
- Miscellaneous Personal Services, Richboro
- Miscellaneous Professional, Richboro
- Mortgage Bankers & Correspondents, Richboro
- Mortgages & Loans, Richboro
- Motion Picture & Television Production Services, Richboro
- Motion Picture Pre & Post Production Services, Richboro
- Motion Pictures Video Tape Duplication & Transfer Services, Richboro
- Motor Vehicle, Richboro
- Motor Vehicle Rental & Leasing, Richboro
- Moving Truck Rental , Richboro
- Multimedia Publishers, Richboro - Multimedia Services & Systems
- Musical Instrument Rental, Richboro - Band & Orchestra Instruments
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