- Machine Shop & Tool Repair Service, Thornton
- Machinery, Supplies & Equipment - Business Production Related, Thornton
- Machinery, Supplies & Equipment - Business Supplies Related, Thornton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Thornton
- Magazine & Newspaper Stands, Thornton - Dealers & Distributors
- Magnetic & Optical Recording Media Manufacturers, Thornton
- Mailbox Rental Services, Thornton
- Mailing, Delivery & Courier Service, Thornton
- Major Appliances, Thornton - Household & Kitchen
- Malls & Shopping Centers, Thornton
- Management Consultants & Services, Thornton
- Manicurists & Pedicurists, Thornton
- Manufacturers Agents & Representatives, Thornton
- Manufacturers Representative, Thornton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Thornton
- Manufacturing Products, Thornton
- Marriage & Family Counselors, Thornton
- Martial Arts & Self Defense Schools, Thornton
- Masonry Contractors, Thornton - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Thornton
- Massage Therapy, Thornton
- Meat Market, Wholesale & Products, Thornton
- Mechanical Contractors, Thornton - Install, Service & Repair
- Medical & Dental Management, Thornton
- Medical Billing Services, Thornton
- Medical Diagnostic Clinics, Thornton - Clinical Labs & Centers
- Medical Groups & Clinics, Thornton - Medical & Health Centers
- Medical Management & Business Administration Service, Thornton
- Medical Research, Thornton
- Medical Research & Development, Thornton - Medical Information & Research
- Medical Supplies & Equipment, Thornton
- Meeting & Event Planning Services, Thornton - Conference Consultants
- Membership Sports & Recreation Clubs, Thornton
- Men's & Boys Clothing & Accessories Stores, Thornton
- Mens & Boys Jeans & Western Wear Stores, Thornton
- Mental Health Specialists, Thornton - Psychologist, Psychiatrist, Psychotherapist, etc
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- Methodist Church, Thornton
- Mexican & Latin American Goods & Products Stores, Thornton
- Mexican Restaurants, Thornton
- Mini & Self Storage, Thornton
- Miscellaneous Business Product Repair, Thornton
- Miscellaneous Household Item Repair, Thornton
- Miscellaneous Business Services, Thornton
- Miscellaneous Government, Thornton
- Miscellaneous Manufacturing, Thornton
- Miscellaneous Personal Services, Thornton
- Miscellaneous Photographers, Thornton
- Miscellaneous Professional, Thornton
- Mission Churches, Thornton
- Mobile Home Parks & Communities , Thornton
- Modular & Mobile Homes For Sale, Thornton - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Thornton
- Mortgage Contracts & Services, Thornton
- Mortgages & Loans, Thornton
- Motion Picture & Television Production Services, Thornton
- Motor Vehicle, Thornton
- Motor Vehicle Rental & Leasing, Thornton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Thornton
- Motorcycle Driving School, Thornton
- Motorcycle Parts, Accessories & Dealers, Thornton
- Motorcycle Repair & Service, Thornton
- Movie Theaters, Thornton
- Moving & Storage Supplies & Equipment, Thornton
- Moving Companies, Thornton
- Moving Truck Rental , Thornton
- Muffler Shop & Exhaust Systems, Thornton
- Multimedia Publishers, Thornton - Multimedia Services & Systems
- Music, Thornton
- Music Schools, Thornton
- Musical Instrument Rental, Thornton - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Thornton
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