- Machine Shop & Tool Repair Service, Gardendale
- Machinery, Supplies & Equipment - Business Production Related, Gardendale
- Machinery, Supplies & Equipment - Business Supplies Related, Gardendale
- Mail Delivery Service, Gardendale
- Mailbox Rental Services, Gardendale
- Mailing, Delivery & Courier Service, Gardendale
- Major Appliances, Gardendale - Household & Kitchen
- Management Consultants & Services, Gardendale
- Manicurists & Pedicurists, Gardendale
- Manufacturers Agents & Representatives, Gardendale
- Manufacturers Representative, Gardendale - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Gardendale
- Martial Arts & Self Defense Schools, Gardendale
- Massage Therapy, Gardendale
- Mausoleums Developers, Gardendale
- Meat Market, Wholesale & Products, Gardendale
- Medical & Dental Management, Gardendale
- Medical Management & Business Administration Service, Gardendale
- Medical Supplies & Equipment, Gardendale
- Membership Sports & Recreation Clubs, Gardendale
- Mental Health Clinics, Gardendale - Treatment Centers
- Mental Health Specialists, Gardendale - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Gardendale
- Merchandising & Marketing Consultants, Gardendale
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- Merle Norman Cosmetics, Gardendale
- Methodist Church, Gardendale
- Mexican Restaurants, Gardendale
- Miscellaneous Government, Gardendale
- Miscellaneous Manufacturing, Gardendale
- Miscellaneous Personal Services, Gardendale
- Miscellaneous Professional, Gardendale
- Mobile Home Parks & Communities , Gardendale
- Modular & Mobile Homes For Sale, Gardendale - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Gardendale
- Mortgage Bankers & Correspondents, Gardendale
- Mortgages & Loans, Gardendale
- Motor Vehicle, Gardendale
- Motor Vehicle Rental & Leasing, Gardendale
- Motorcycle & Motor Scooters Dealers, Repair & Service, Gardendale
- Motorcycle Repair & Service, Gardendale
- Moving & Storage Supplies & Equipment, Gardendale
- Moving Companies, Gardendale
- Moving Supplies & Equipment Rental, Gardendale
- Moving Truck Rental , Gardendale
- Muffler Shop & Exhaust Systems, Gardendale
- Music, Gardendale
- Musical Instruments & Equipment Stores, Gardendale
- Musical Instruments Repair, Sales & Service, Gardendale
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