- Machine Shop & Tool Repair Service, Huntsville
- Machinery, Supplies & Equipment - Business Production Related, Huntsville
- Machinery, Supplies & Equipment - Business Supplies Related, Huntsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Huntsville
- Magazine & Newspaper Stands, Huntsville - Dealers & Distributors
- Mailing, Delivery & Courier Service, Huntsville
- Maintenance, Cleaning & Sanitation, Huntsville
- Major Appliances, Huntsville - Household & Kitchen
- Malls & Shopping Centers, Huntsville
- Management Consultants & Services, Huntsville
- Manicurists & Pedicurists, Huntsville
- Manufacturing, Huntsville
- Manufacturing Products, Huntsville
- Maps & Globes, Huntsville
- Marinas & Marina Services, Huntsville
- Marine Supplies & Equipment, Huntsville - Boat Supplies
- Marriage & Family Counselors, Huntsville
- Martial Arts & Self Defense Schools, Huntsville
- Masonry Contractors, Huntsville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Huntsville
- Massage Therapists & Professional, Huntsville
- Massage Therapy, Huntsville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Huntsville
- Material Handling, Huntsville
- Maternity Clothes & Clothing Stores, Huntsville - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Huntsville
- Medical Supplies & Equipment, Huntsville
- Membership Sports & Recreation Clubs, Huntsville
- Men's & Boys Clothing & Accessories Stores, Huntsville
- Men's Clothing Stores, Huntsville - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Huntsville
- Mental Health Specialists, Huntsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Huntsville
- Metal Buildings, Huntsville - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Huntsville - Iron Works
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- Mildew Removal & Control, Huntsville - Mold Removal
- Millwrights, Huntsville
- Mini & Self Storage, Huntsville
- Mining, Huntsville
- Mining Development & Exploration, Huntsville
- Mining Services, Huntsville
- Miscellaneous Agriculture, Huntsville
- Miscellaneous Business Services, Huntsville
- Miscellaneous Government, Huntsville
- Miscellaneous Personal Services, Huntsville
- Miscellaneous Photographers, Huntsville
- Miscellaneous Professional, Huntsville
- Mobile Home Parks & Communities , Huntsville
- Modular Buildings, Huntsville - Modular Homes Buildings & Offices
- Moldings Materials, Huntsville
- Money Transfer Service, Huntsville
- Monuments, Tombstones, Markers & Memorials, Huntsville
- Mortgage Bankers & Correspondents, Huntsville
- Mortgage Brokers, Huntsville
- Motion Picture Pre & Post Production Services, Huntsville
- Motor Vehicle, Huntsville
- Motor Vehicle Rental & Leasing, Huntsville
- Movie Theaters, Huntsville
- Moving Companies, Huntsville
- Moving Truck Rental , Huntsville
- Muffler Shop & Exhaust Systems, Huntsville
- Museums, Huntsville
- Music, Huntsville
- Music Lessons, Huntsville
- Music Lessons - Instrumental, Huntsville
- Musical Instrument Rental, Huntsville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Huntsville
- Musical Instruments Repair, Sales & Service, Huntsville
- Musical Recording Services, Huntsville
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