- 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
- Malls & Shopping Centers, Aurora
- Management Consultants & Services, Aurora
- Manicurists & Pedicurists, Aurora
- Manufacturing, Aurora
- Manufacturing Products, Aurora
- Marinas & Marina Services, Aurora
- Masonry Contractors, Aurora - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Aurora
- Massage Therapy, Aurora
- Medical & Dental Management, Aurora
- Medical & Infectious Waste Disposal, Aurora
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Aurora
- Medical Management & Business Administration Service, Aurora
- Medical Supplies & Equipment, Aurora
- Men's Clothing Stores, Aurora - Clothes & Accessories
- Merchandise Sales Events, Aurora
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- Methodist Church, Aurora
- Mexican Restaurants, Aurora
- Minerals, Aurora
- Mini & Self Storage, Aurora
- Mini Golf Courses, Aurora
- Mining, Aurora
- Mining Equipment & Supplies, Aurora
- Miscellaneous Agriculture, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Personal Services, Aurora
- Miscellaneous Professional, Aurora
- Monuments, Tombstones, Markers & Memorials, Aurora
- Mortgages & Loans, Aurora
- Motor Vehicle, Aurora
- Motor Vehicle Rental & Leasing, Aurora
- Motorcycle & Motor Scooters Dealers, Repair & Service, Aurora
- Motorcycle Repair & Service, Aurora
- Moving Truck Rental , Aurora
- Muffler Shop & Exhaust Systems, Aurora
- Mulch, Peat & Moss Products, Aurora
- Museums, Aurora
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