- Machine Shop & Tool Repair Service, Irondale
- Machinery, Supplies & Equipment - Business Production Related, Irondale
- Machinery, Supplies & Equipment - Business Supplies Related, Irondale
- Machinery, Supplies & Equipment - Construction & Contractor Related, Irondale
- Mailing, Delivery & Courier Service, Irondale
- Malls & Shopping Centers, Irondale
- Management Consultants & Services, Irondale
- Manicurists & Pedicurists, Irondale
- Manufacturers Agents & Representatives, Irondale
- Manufacturers Representative, Irondale - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Irondale
- Manufacturing Products, Irondale
- Material Handling Equipment, Irondale - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Irondale
- Medical Diagnostic Clinics, Irondale - Clinical Labs & Centers
- Medical Supplies & Equipment, Irondale
- Membership Sports & Recreation Clubs, Irondale
- Men's Clothing Stores, Irondale - Clothes & Accessories
- Mental Health Clinics, Irondale - Treatment Centers
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- Merchandising & Marketing Consultants, Irondale
- Methodist Church, Irondale
- Mexican Restaurants, Irondale
- Mini & Self Storage, Irondale
- Ministries Church, Irondale
- Miscellaneous Household Item Repair, Irondale
- Miscellaneous Business Services, Irondale
- Miscellaneous Government, Irondale
- Miscellaneous Manufacturing, Irondale
- Miscellaneous Personal Services, Irondale
- Miscellaneous Professional, Irondale
- Mobile Home Parks & Communities , Irondale
- Mortgage Bankers & Correspondents, Irondale
- Mortgages & Loans, Irondale
- Motor Vehicle, Irondale
- Motor Vehicle Rental & Leasing, Irondale
- Motorcycle Parts, Accessories & Dealers, Irondale
- Movie Theaters, Irondale
- Moving Companies, Irondale
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