- Magazine Distributors
- Mailing Equipment
- Major Appliance Stores
- Marijuana Retail
- Massage Therapists
- Mattresses
- Media Monitoring
- Medical Information
- Mediterranean Restaurants
- Mental Health Service
- Metal Specialties
- Mexican Restaurants
- Middle Eastern Restaurants
- Military Goods
- Minerals
- Missions
- Mobile Home Dealers
- Modelling Agencies
- Mortgages
- Motels
- Mufflers
- Municipal Government
- Music Publishers
- Mutual Funds