- Machine Shop Supplies
- Machine Shops
- Machinery Repair
- Machinery Sales
- Magazine Advertising
- Magazine Distributors
- Mailboxes
- Mailing Lists
- Major Appliance Stores
- Management Consultants
- Maple Syrup
- Maps
- Marble
- Marijuana Retail
- Marinas
- Marketing Agencies
- Martial Arts Schools
- Masons
- Massage Therapists
- Massage Therapy Schools
- Material Handling Equipment
- Maternity Clothes
- Mattresses
- Meat Packers
- Meat Wholesalers
- Mechanical Contractors
- Media Monitoring
- Medical Centres
- Medical Clinics
- Medical Information
- Medical Laboratories
- Medical Supplies
- Mediterranean Restaurants
- Mental Health Service
- Merchandise Warehouses
- Metal Finishers
- Metal Forming
- Metal Specialties
- Metal Stamping
- Metal Stamps
- Metals
- Metaphysical Products and Services
- Mexican Restaurants
- Middle Eastern Restaurants
- Military Goods
- Millwork
- Minerals
- Mining Exploration
- Mirrors
- Missions
- Mobile Home Dealers
- Modelling Agencies
- Mortgage Brokers
- Mortgages
- Motorcycles
- Mould Makers
- Mould Removal
- Moving and Storage
- Mufflers
- Municipal Government
- Music Arrangers
- Music Lessons
- Music Publishers
- Musicians