- Machine Shop & Tool Repair Service, Richmond Hill
- Machinery, Supplies & Equipment - Business Production Related, Richmond Hill
- Machinery, Supplies & Equipment - Construction & Contractor Related, Richmond Hill
- Mailbox Rental Services, Richmond Hill
- Mailing, Delivery & Courier Service, Richmond Hill
- Maintenance, Cleaning & Sanitation, Richmond Hill
- Management Consultants & Services, Richmond Hill
- Manicurists & Pedicurists, Richmond Hill
- Manufacturing, Richmond Hill
- Manufacturing Products, Richmond Hill
- Marinas & Marina Services, Richmond Hill
- Marine Contractors & Designers, Richmond Hill
- Marine Surveyors & Adjustors, Richmond Hill
- Marriage & Family Counselors, Richmond Hill
- Martial Arts & Self Defense Schools, Richmond Hill
- Masonry Materials & Supplies, Richmond Hill
- Massage Therapy, Richmond Hill
- Mental Health Specialists, Richmond Hill - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merle Norman Cosmetics, Richmond Hill
- Metal Working Machinery, Richmond Hill
- Methodist Church, Richmond Hill
- Mexican Restaurants, Richmond Hill
- Mini & Self Storage, Richmond Hill
- Miscellaneous Government, Richmond Hill
- Miscellaneous Personal Services, Richmond Hill
- Miscellaneous Professional, Richmond Hill
- Mobile Homes for Rent & Lease, Richmond Hill
- Mortgage Bankers & Correspondents, Richmond Hill
- Mortgage Companies, Richmond Hill
- Motor Vehicle, Richmond Hill
- Motor Vehicle Rental & Leasing, Richmond Hill
- Motorcycle Parts, Accessories & Dealers, Richmond Hill
- Moving & Storage Supplies & Equipment, Richmond Hill
- Moving Companies, Richmond Hill
- Moving Supplies & Equipment Rental, Richmond Hill
- Moving Truck Rental , Richmond Hill
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