- Machine Shop & Tool Repair Service, Aurora
- Machine Tools , Aurora
- Machinery Repair & Rebuild, 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
- Mailbox Rental Services, Aurora
- Mailing, Delivery & Courier Service, Aurora
- Major Appliances, Aurora - Household & Kitchen
- Management Consultants & Services, Aurora
- Manicurists & Pedicurists, Aurora
- Manifold Business Forms Manufacturers, Aurora
- Manufacturers Agents & Representatives, Aurora
- Manufacturers Representative, Aurora - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Aurora
- Manufacturing Products, Aurora
- Manufacturing Services, Aurora
- Martial Arts & Self Defense Schools, Aurora
- Massage Therapists & Professional, Aurora
- Massage Therapy, Aurora
- Material Handling, Aurora
- Meat Market, Wholesale & Products, Aurora
- Membership Sports & Recreation Clubs, Aurora
- Men's Clothing Stores, Aurora - Clothes & Accessories
- Men's Shoe Stores, Aurora
- Mennonite Church, Aurora
- Mens & Womens Clothing, Aurora
- Mental Health Specialists, Aurora - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Aurora
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- Metal Repair Service & Blacksmith, Aurora - Iron Works
- Methodist Church, Aurora
- Mexican Restaurants, Aurora
- Middle Eastern Restaurants, Aurora
- Mining, Aurora
- Ministries Church, Aurora
- Miscellaneous Business Services, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Manufacturing, Aurora
- Miscellaneous Personal Services, Aurora
- Miscellaneous Professional, Aurora
- Mortgage Bankers & Correspondents, Aurora
- Mortgage Contracts & Services, Aurora
- Mortgages & Loans, Aurora
- Motion Pictures Video Tape Duplication & Transfer Services, Aurora
- Motivational Speakers & Consultants, Aurora - Speakers, Lectures & Seminars
- Motor Vehicle, Aurora
- Motorcycle Parts, Accessories & Dealers, Aurora
- Motorcycle Repair & Service, Aurora
- Motorcycles Paint & Refinishing, Aurora
- Movie Theaters, Aurora
- Moving & Storage Supplies & Equipment, Aurora
- Museums, Aurora
- Music, Aurora
- Music Entertainment, Aurora
- Music Lessons, Aurora
- Music Lessons - Instrumental, Aurora
- Music Lessons - Vocal, Aurora
- Music Schools, Aurora
- Musical Recording Services, Aurora
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