- Machine Shop & Tool Repair Service, Aurora
- Machinery, Supplies & Equipment - Business Production Related, Aurora
- Management Consultants & Services, Aurora
- Manufacturers Agents & Representatives, Aurora
- Manufacturers Representative, Aurora - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Aurora
- Manufacturing Products, Aurora
- Marine Supplies & Equipment, Aurora - Boat Supplies
- Masonry Materials & Supplies, Aurora
- Meat Market, Wholesale & Products, Aurora
- Membership Sports & Recreation Clubs, Aurora
- Mennonite Church, Aurora
- Merchandising & Pricing Equipment, Aurora
- Mexican Restaurants, Aurora
- Midwives, Aurora
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- Miscellaneous Household Item Repair, Aurora
- Miscellaneous Agriculture, Aurora
- Miscellaneous Business Services, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Manufacturing, Aurora
- Mobile Home Parks & Communities , Aurora
- Modular & Mobile Homes For Sale, Aurora - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Aurora
- Motion Picture & Television Production Services, Aurora
- Motion Picture Dists & Producers, Aurora
- Motor Vehicle, Aurora
- Motor Vehicle Rental & Leasing, Aurora
- Motorcycle Parts, Accessories & Dealers, Aurora
- Moving Truck Rental , Aurora
- Museums, Aurora
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