- Machine Shop & Tool Repair Service, South Richmond Hill
- Machinery, Supplies & Equipment - Business Production Related, South Richmond Hill
- Machinery, Supplies & Equipment - Business Supplies Related, South Richmond Hill
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Richmond Hill
- Mailbox Rental Services, South Richmond Hill
- Mailing, Delivery & Courier Service, South Richmond Hill
- Major Appliances, South Richmond Hill - Household & Kitchen
- Management Consultants & Services, South Richmond Hill
- Manicurists & Pedicurists, South Richmond Hill
- Manufacturing, South Richmond Hill
- Marriage & Family Counselors, South Richmond Hill
- Material Handling Equipment, South Richmond Hill - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, South Richmond Hill
- Medical & Dental Management, South Richmond Hill
- Medical & Health Service Organizations, South Richmond Hill
- Medical & Infectious Waste Disposal, South Richmond Hill
- Medical Diagnostic Clinics, South Richmond Hill - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, South Richmond Hill
- Men's & Boys Clothing & Accessories Stores, South Richmond Hill
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- Mental Health Specialists, South Richmond Hill - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South Richmond Hill
- Messenger Service, South Richmond Hill - Message Receiving & Forwarding Service
- Metal Repair Service & Blacksmith, South Richmond Hill - Iron Works
- Methodist Church, South Richmond Hill
- Mexican Restaurants, South Richmond Hill
- Middle Eastern Restaurants, South Richmond Hill
- Miscellaneous Household Item Repair, South Richmond Hill
- Miscellaneous Professional, South Richmond Hill
- Mortgage Bankers & Correspondents, South Richmond Hill
- Motor Vehicle, South Richmond Hill
- Motor Vehicle Rental & Leasing, South Richmond Hill
- Movie Theaters, South Richmond Hill
- Moving & Storage Supplies & Equipment, South Richmond Hill
- Moving Supplies & Equipment Rental, South Richmond Hill
- Moving Truck Rental , South Richmond Hill
- Music, South Richmond Hill
- Musical Instrument Rental, South Richmond Hill - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, South Richmond Hill
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