- Machine Shop, Aurora
- Machine Shop & Tool Repair Service, Aurora
- Machine Shop Rotary Surface Grinding, Aurora - Tool Grinding & Sharpening
- Machine Tools , Aurora
- Machinery And Equipment Manufacturers, Aurora
- Machinery, Supplies & Equipment - Business Production Related, Aurora
- Machinery, Supplies & Equipment - Business Supplies Related, Aurora
- Machinery, Supplies & Equipment - Construction & Contractor Related, Aurora
- Magazine & Newspaper Stands, Aurora - Dealers & Distributors
- Mailbox Rental Services, Aurora
- Mailing, Delivery & Courier Service, Aurora
- Maintenance, Cleaning & Sanitation, Aurora
- Major Appliances, Aurora - Household & Kitchen
- Malls & Shopping Centers, Aurora
- Management Consultants & Services, Aurora
- Mandarin Restaurants, Aurora
- Manicurists & Pedicurists, Aurora
- Manufactured & Mobile Home Movers & Transporting, Aurora
- Manufacturers Agents & Representatives, Aurora
- Manufacturers Representative, Aurora - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Aurora
- Manufacturing Products, Aurora
- Manufacturing Services, Aurora
- Map Publishers & Printers, Aurora
- Mapping & Topographical Services, Aurora
- Marble, Aurora
- Marinas & Marina Services, Aurora
- Market Research & Analysis , Aurora - Market Analysis, Business & Economic Research
- Marketing Schools, Aurora
- Marriage & Family Counselors, Aurora
- Marriage & Family Counselors Information & Referrals, Aurora
- Martial Arts & Self Defense Schools, Aurora
- Masonry Contractors, Aurora - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Aurora
- Massage Therapists & Professional, Aurora
- Massage Therapy, Aurora
- Massage Therapy Relaxation, Aurora
- Mattress & Bedspring Manufacturers, Aurora
- Maytag Appliances, Aurora
- Meat Market, Wholesale & Products, Aurora
- Mechanical Contractors, Aurora - Install, Service & Repair
- Mechanical Engineer, Aurora - Mechanical Engineering Service
- Media Consultants, Aurora
- Medical & Dental Management, Aurora
- Medical & Health Service Organizations, Aurora
- Medical Alert Systems, Aurora - Medical Alarms - PERS
- Medical Diagnostic Clinics, Aurora - Clinical Labs & Centers
- Medical Equipment Manufacturers, Aurora
- Medical Records Service , Aurora
- Medical Research, Aurora
- Medical Research & Development, Aurora - Medical Information & Research
- Medical Supplies & Equipment, Aurora
- Medical Transcription Service, Aurora
- Mediterranean Restaurants, Aurora
- Meeting & Event Planning Services, Aurora - Conference Consultants
- Membership Sports & Recreation Clubs, Aurora
- Men's & Boys Clothing & Accessories Stores, Aurora
- Men's Clothing Stores, Aurora - Clothes & Accessories
- Men's Shoe Stores, Aurora
- Mennonite Church, Aurora
- Mens & Boys Belts & Suspenders, Aurora
- Mens & Boys Jeans & Western Wear Stores, Aurora
- Mental Health Specialists, Aurora - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Aurora
- Merchandising & Pricing Equipment, Aurora
- Metal Buildings, Aurora - Kits, Homes, Steel Buildings, etc
- Metal Cleaning & Pickling, Aurora
- Metal Heat Treating, Aurora
- Metal Perforating & Punching, Aurora
- Metal Plating & Polishing, Aurora
- Metal Products, Aurora
- Metal Services, Aurora
- Metal Specialties, Aurora
- Metal Working Machinery, Aurora
- Metals, Aurora
- Metaphysical Churches, Aurora
- Methodist Church, Aurora
- Mexican Food, Aurora
- Mexican Food & Goods Products, Aurora
- Mexican Restaurants, Aurora
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- Microwave Oven Repair & Service, Aurora
- Middle Eastern Restaurants, Aurora
- Mildew Removal & Control, Aurora - Mold Removal
- Military Supplies, Aurora
- Millwork Contractors, Aurora
- Millwrights, Aurora
- Mind-Body Massage, Aurora
- Minerals, Aurora
- Mini & Self Storage, Aurora
- Mining, Aurora
- Ministries Church, Aurora
- Miscellaneous Business Credit Institutions & Services, Aurora
- Miscellaneous Business Product Repair, Aurora
- Miscellaneous Household Item Repair, Aurora
- Miscellaneous Agriculture, Aurora
- Miscellaneous Business Services, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Industry, Aurora
- Miscellaneous Jewelry, Aurora
- Miscellaneous Manufacturing, Aurora
- Miscellaneous Personal Services, Aurora
- Miscellaneous Photographers, Aurora
- Miscellaneous Professional, Aurora
- Miscellaneous Toys & Supplies, Aurora
- Mission Churches, Aurora
- Mobile Home Contractors, Aurora
- Mobile Home Improvements & Repairs, Aurora
- Mobile Home Parks & Communities , Aurora
- Modular & Mobile Homes For Sale, Aurora - Manufactured Homes Sale & Service
- Molds, Aurora
- Money Transfer Service, Aurora
- Mopeds & Motor Scooters Rental, Aurora
- Mortgage Bankers & Correspondents, Aurora
- Mortgage Brokers, Aurora
- Mortgage Companies, Aurora
- Mortgage Contracts & Services, Aurora
- Mortgage Feasibility Consultants, Aurora
- Mortgage Loan Processors, Aurora
- Mortgage Service Bureaus, Aurora
- Mortgages & Loans, Aurora
- Motion Picture & Television Production Services, Aurora
- Motion Picture Dists & Producers, Aurora
- Motion Picture Pre & Post Production Services, Aurora
- Motivational & Self Improvement Schools, Aurora
- Motivational Speakers & Consultants, Aurora - Speakers, Lectures & Seminars
- Motor Homes, Aurora
- Motor Vehicle, Aurora
- Motor Vehicle Rental & Leasing, Aurora
- Motorcycle & ATV Repair & Service, Aurora
- Motorcycle & Motor Scooters Dealers, Repair & Service, Aurora
- Motorcycle Driving School, Aurora
- Motorcycle Parts, Accessories & Dealers, Aurora
- Motorcycle Repair & Service, Aurora
- Movie Theaters, Aurora
- Moving & Storage Supplies & Equipment, Aurora
- Moving Companies, Aurora
- Moving Services - Labor & Material, Aurora
- Moving Supplies & Equipment Rental, Aurora
- Moving Truck Rental , Aurora
- Muffler Shop & Exhaust Systems, Aurora
- Mulch, Peat & Moss Products, Aurora
- Multimedia Publishers, Aurora - Multimedia Services & Systems
- Museums, Aurora
- Music, Aurora
- Music Entertainment, Aurora
- Music Lessons, Aurora
- Music Lessons - Instrumental, Aurora
- Music Lessons - Vocal, Aurora
- Music Live & Pre Recorded, Aurora
- Music Schools, Aurora
- Music Teachers, Aurora
- Music Therapy, Aurora
- Musical Instrument Manufacturers, Aurora
- Musical Instrument Rental, Aurora - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Aurora
- Musical Instruments - Violins, Aurora
- Musical Instruments Repair, Sales & Service, Aurora
- Musical Recording Services, Aurora
- Musicians, Bands & Disc Jockeys, Aurora
- Muslim Church, Aurora
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