- Machine Shop & Tool Repair Service, Derby
- Machinery, Supplies & Equipment - Business Production Related, Derby
- Machinery, Supplies & Equipment - Business Supplies Related, Derby
- Management Consultants & Services, Derby
- Manicurists & Pedicurists, Derby
- Manufacturing, Derby
- Manufacturing Products, Derby
- Manufacturing Services, Derby
- Marble, Derby
- Marriage & Family Counselors, Derby
- Marriage & Family Counselors Information & Referrals, Derby
- Martial Arts & Self Defense Schools, Derby
- Masonry Contractors, Derby - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Derby
- Massage Therapists & Professional, Derby
- Massage Therapy, Derby
- Medical Billing Services, Derby
- Medical Supplies & Equipment, Derby
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- Mental Health Clinics, Derby - Treatment Centers
- Merchandise Sales Events, Derby
- Merchandising & Marketing Consultants, Derby
- Metal Buildings, Derby - Kits, Homes, Steel Buildings, etc
- Methodist Church, Derby
- Mexican Restaurants, Derby
- Mini & Self Storage, Derby
- Mining, Derby
- Miscellaneous Business Services, Derby
- Miscellaneous Personal Services, Derby
- Miscellaneous Photographers, Derby
- Monuments, Tombstones, Markers & Memorials, Derby
- Mortgage Bankers & Correspondents, Derby
- Motion Picture & Television Production Services, Derby
- Motor Vehicle, Derby
- Motorcycle Parts, Accessories & Dealers, Derby
- Muffler Shop & Exhaust Systems, Derby
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