- 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
- Mail Delivery Service, Aurora
- Malls & Shopping Centers, Aurora
- Management Consultants & Services, Aurora
- Manicurists & Pedicurists, Aurora
- Manufacturing, Aurora
- Manufacturing Products, 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
- Meat Market, Wholesale & Products, Aurora
- Medical Supplies & Equipment, Aurora
- Membership Sports & Recreation Clubs, Aurora
- Merchandise Sales Events, Aurora
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- Meters Repair, Aurora
- Methodist Church, Aurora
- Military Supplies, Aurora
- Miscellaneous Business Product Repair, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Industry, Aurora
- Miscellaneous Manufacturing, Aurora
- Miscellaneous Personal Services, Aurora
- Miscellaneous Photographers, Aurora
- Miscellaneous Professional, Aurora
- Mobile Homes Manufactures, Aurora
- Money Transfer Service, Aurora
- Mortgage Bankers & Correspondents, Aurora
- Motor Vehicle, Aurora
- Motor Vehicle Rental & Leasing, Aurora
- Motorcycle Parts, Accessories & Dealers, Aurora
- Movie Theaters, Aurora
- Moving Truck Rental , Aurora
- Museums, Aurora
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