- Machine Shop Supplies
- Machine Shops
- Manufactured Homes
- Maps
- Marble
- Marijuana Retail
- Massage Therapists
- Mechanical Contractors
- Medical Centres
- Medical Laboratories
- Medical Supplies
- Mediterranean Restaurants
- Mental Health Service
- Merchandise Warehouses
- Mexican Restaurants
- Middle Eastern Restaurants
- Minerals
- Mining Companies
- Miscellaneous Investments
- Mobile Home Dealers
- Motels
- Mould Removal
- Mufflers
- Municipal Government
- Museums
- Music Stores
- Musicians
- Mutual Funds