- Machine Shop & Tool Repair Service, Hillsborough
- Machinery, Supplies & Equipment - Business Supplies Related, Hillsborough
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hillsborough
- Mail Delivery Service, Hillsborough
- Maintenance, Cleaning & Sanitation, Hillsborough
- Management Consultants & Services, Hillsborough
- Manicurists & Pedicurists, Hillsborough
- Manufacturing, Hillsborough
- Marriage & Family Counselors, Hillsborough
- Massage Therapists & Professional, Hillsborough
- Massage Therapy, Hillsborough
- Mediterranean Restaurants, Hillsborough
- Mental Health Specialists, Hillsborough - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Hillsborough
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- Metal Products, Hillsborough
- Methodist Church, Hillsborough
- Midwives, Hillsborough
- Mildew Removal & Control, Hillsborough - Mold Removal
- Miscellaneous Business Product Repair, Hillsborough
- Miscellaneous Government, Hillsborough
- Miscellaneous Manufacturing, Hillsborough
- Miscellaneous Personal Services, Hillsborough
- Miscellaneous Professional, Hillsborough
- Motor Vehicle, Hillsborough
- Motor Vehicle Rental & Leasing, Hillsborough
- Moving Supplies & Equipment Rental, Hillsborough
- Moving Truck Rental , Hillsborough
- Museums, Hillsborough
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