- Machine Shop & Tool Repair Service, Irwin
- Machine Tools , Irwin
- Machinery And Equipment Manufacturers, Irwin
- Machinery, Supplies & Equipment - Business Production Related, Irwin
- Machinery, Supplies & Equipment - Business Supplies Related, Irwin
- Machinery, Supplies & Equipment - Construction & Contractor Related, Irwin
- Magazine & Newspaper Stands, Irwin - Dealers & Distributors
- Mail Delivery Service, Irwin
- Mailing, Delivery & Courier Service, Irwin
- Maintenance, Cleaning & Sanitation, Irwin
- Major Appliances, Irwin - Household & Kitchen
- Management Consultants & Services, Irwin
- Manicurists & Pedicurists, Irwin
- Manufacturers Agents & Representatives, Irwin
- Manufacturers Representative, Irwin - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Irwin
- Manufacturing Products, Irwin
- Marriage & Family Counselors, Irwin
- Martial Arts & Self Defense Schools, Irwin
- Masonry Contractors, Irwin - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Irwin
- Massage Therapists & Professional, Irwin
- Massage Therapy, Irwin
- Material Handling Equipment, Irwin - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, Irwin
- Measuring Instruments, Irwin - Measuring Machines & Equipment
- Meat Market, Wholesale & Products, Irwin
- Mechanical Contractors, Irwin - Install, Service & Repair
- Medical & Dental Management, Irwin
- Medical Diagnostic Clinics, Irwin - Clinical Labs & Centers
- Medical Groups & Clinics, Irwin - Medical & Health Centers
- Medical Supplies & Equipment, Irwin
- Membership Sports & Recreation Clubs, Irwin
- Men's Clothing Stores, Irwin - Clothes & Accessories
- Mental Health Specialists, Irwin - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Irwin - Message Receiving & Forwarding Service
- Metal Cutting Machines, Irwin
- Metal Powder Products, Irwin
- Metal Products, Irwin
- Metal Specialties, Irwin
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- Metal Working Machinery, Irwin
- Methodist Church, Irwin
- Mexican Restaurants, Irwin
- Mildew Removal & Control, Irwin - Mold Removal
- Mini & Self Storage, Irwin
- Mini Golf Courses, Irwin
- Mining Equipment & Supplies Service & Repair, Irwin
- Miscellaneous Household Item Repair, Irwin
- Miscellaneous Retail Stores, Irwin
- Miscellaneous Government, Irwin
- Miscellaneous Manufacturing, Irwin
- Miscellaneous Personal Services, Irwin
- Miscellaneous Photographers, Irwin
- Miscellaneous Professional, Irwin
- Mobile Home Parks & Communities , Irwin
- Modular & Mobile Homes For Sale, Irwin - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Irwin
- Mortgage Bankers & Correspondents, Irwin
- Mortgage Companies, Irwin
- Mortgages & Loans, Irwin
- Motion Picture Pre & Post Production Services, Irwin
- Motor Vehicle, Irwin
- Motor Vehicle Rental & Leasing, Irwin
- Motorcycle & Motor Scooters Dealers, Repair & Service, Irwin
- Motorcycle Parts, Accessories & Dealers, Irwin
- Motorcycle Repair & Service, Irwin
- Moving & Storage Supplies & Equipment, Irwin
- Moving Companies, Irwin
- Moving Supplies & Equipment Rental, Irwin
- Moving Truck Rental , Irwin
- Muffler Shop & Exhaust Systems, Irwin
- Mulch, Peat & Moss Products, Irwin
- Music, Irwin
- Music Lessons, Irwin
- Music Lessons - Instrumental, Irwin
- Music Lessons - Vocal, Irwin
- Music Schools, Irwin
- Musical Instrument Rental, Irwin - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Irwin
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