- Machine Shop, Aurora
- Machine Shop & Tool Repair Service, Aurora
- Machinery, Supplies & Equipment - Business Production Related, Aurora
- Machinery, Supplies & Equipment - Business Supplies Related, Aurora
- Machinery, Supplies & Equipment - Construction & Contractor Related, Aurora
- Major Appliances, Aurora - Household & Kitchen
- Manicurists & Pedicurists, Aurora
- Manufacturers Agents & Representatives, Aurora
- Manufacturers Representative, Aurora - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Aurora
- Marriage & Family Counselors, Aurora
- Masonry Contractors, Aurora - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Aurora
- Massage Therapists & Professional, Aurora
- Massage Therapy, Aurora
- Mausoleums Developers, Aurora
- Medical Diagnostic Clinics, Aurora - Clinical Labs & Centers
- Medical Supplies & Equipment, Aurora
- Mental Health Specialists, Aurora - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Aurora
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- Methodist Church, Aurora
- Mini & Self Storage, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Industry, Aurora
- Miscellaneous Manufacturing, Aurora
- Miscellaneous Personal Services, Aurora
- Miscellaneous Photographers, Aurora
- Miscellaneous Professional, Aurora
- Mobile Home Insurance, Aurora
- Mobile Home Parks & Communities , Aurora
- Modular & Mobile Homes For Sale, Aurora - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Aurora
- Mortgage Bankers & Correspondents, Aurora
- Motor Vehicle, Aurora
- Motor Vehicle Rental & Leasing, Aurora
- Motorcycle Parts, Accessories & Dealers, Aurora
- Moving Supplies & Equipment Rental, Aurora
- Moving Truck Rental , Aurora
- Music, Aurora
- Musical Instruments & Equipment Stores, Aurora
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