- Machine Shop & Tool Repair Service, Derby
- Machinery, Supplies & Equipment - Business Production Related, Derby
- Machinery, Supplies & Equipment - Business Supplies Related, Derby
- Machinery, Supplies & Equipment - Construction & Contractor Related, Derby
- Mailbox Rental Services, Derby
- Mailing, Delivery & Courier Service, Derby
- Management Consultants & Services, Derby
- Manicurists & Pedicurists, Derby
- Manufacturing, Derby
- Manufacturing Services, Derby
- Marriage & Family Counselors, Derby
- Martial Arts & Self Defense Schools, Derby
- Mary Kay Cosmetics, Derby
- Masonry Materials & Supplies, Derby
- Massage Therapists & Professional, Derby
- Massage Therapy, Derby
- Material Handling & Heavy Machinery & Equipment, Derby
- Meat Market, Wholesale & Products, Derby
- Mechanical Seals, Derby
- Medical Research, Derby
- Medical Research & Development, Derby - Medical Information & Research
- Medical Supplies & Equipment, Derby
- Membership Sports & Recreation Clubs, Derby
- Mental Health Specialists, Derby - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Derby - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Derby
- Mexican Restaurants, Derby
- Mining, Derby
- Miscellaneous Agriculture, Derby
- Miscellaneous Government, Derby
- Miscellaneous Personal Services, Derby
- Miscellaneous Professional, Derby
- Mobile Home Parks & Communities , Derby
- Mortgage Bankers & Correspondents, Derby
- Motor Vehicle, Derby
- Motor Vehicle Rental & Leasing, Derby
- Motorcycle Detailing, Derby
- Motorcycle Repair & Service, Derby
- Motorcycles Paint & Refinishing, Derby
- Movie Theaters, Derby
- Moving & Storage Supplies & Equipment, Derby
- Moving Truck Rental , Derby
- Mowing Service, Derby
- Muffler Shop & Exhaust Systems, Derby
- Music, Derby
- Music Lessons, Derby
- Music Lessons - Instrumental, Derby
- Musical Instrument Rental, Derby - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Derby
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