- Machine Shop & Tool Repair Service, Irmo
- Machinery, Supplies & Equipment - Business Production Related, Irmo
- Machinery, Supplies & Equipment - Business Supplies Related, Irmo
- Machinery, Supplies & Equipment - Construction & Contractor Related, Irmo
- Mailbox Rental Services, Irmo
- Mailing, Delivery & Courier Service, Irmo
- Maintenance, Cleaning & Sanitation, Irmo
- Major Appliance Repair & Service, Irmo
- Management Consultants & Services, Irmo
- Manicurists & Pedicurists, Irmo
- Manufacturing, Irmo
- Manufacturing Products, Irmo
- Marinas & Marina Services, Irmo
- Marine Supplies & Equipment, Irmo - Boat Supplies
- Marriage & Family Counselors, Irmo
- Martial Arts & Self Defense Schools, Irmo
- Masonry Contractors, Irmo - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Irmo
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Irmo
- Medical Supplies & Equipment, Irmo
- Membership Sports & Recreation Clubs, Irmo
- Mental Health Specialists, Irmo - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Irmo - Kits, Homes, Steel Buildings, etc
- Metal Working Machinery, Irmo
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- Methodist Church, Irmo
- Mexican Restaurants, Irmo
- Mildew Removal & Control, Irmo - Mold Removal
- Millwork Contractors, Irmo
- Miscellaneous Government, Irmo
- Miscellaneous Personal Services, Irmo
- Miscellaneous Professional, Irmo
- Moisture & Vapor Control, Irmo
- Mortgage Bankers & Correspondents, Irmo
- Mortgage Companies, Irmo
- Mortgages & Loans, Irmo
- Motion Picture & Television Production Services, Irmo
- Motion Picture Dists & Producers, Irmo
- Motivational Speakers & Consultants, Irmo - Speakers, Lectures & Seminars
- Motor Vehicle, Irmo
- Motor Vehicle Rental & Leasing, Irmo
- Motorcycle Parts, Accessories & Dealers, Irmo
- Moving & Storage Supplies & Equipment, Irmo
- Moving Companies, Irmo
- Moving Truck Rental , Irmo
- Muffler Shop & Exhaust Systems, Irmo
- Music, Irmo
- Musical Instruments & Equipment Stores, Irmo
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