- Machinery, Supplies & Equipment - Business Supplies Related, Osterville
- Maintenance, Cleaning & Sanitation, Osterville
- Management Consultants & Services, Osterville
- Manicurists & Pedicurists, Osterville
- Manufacturers Agents & Representatives, Osterville
- Manufacturers Representative, Osterville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Osterville
- Manufacturing Products, Osterville
- Marinas & Marina Services, Osterville
- Marriage & Family Counselors, Osterville
- Masonry Contractors, Osterville - Stone Mason, Brick Mason - Install & Repair
- Material Handling Equipment, Osterville - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Diagnostic Clinics, Osterville - Clinical Labs & Centers
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- Membership Sports & Recreation Clubs, Osterville
- Mental Health Specialists, Osterville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Osterville
- Mildew Removal & Control, Osterville - Mold Removal
- Miscellaneous Business Services, Osterville
- Miscellaneous Manufacturing, Osterville
- Miscellaneous Personal Services, Osterville
- Miscellaneous Photographers, Osterville
- Miscellaneous Professional, Osterville
- Mortgage Bankers & Correspondents, Osterville
- Motor Vehicle, Osterville
- Motor Vehicle Rental & Leasing, Osterville
- Museums, Osterville
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