- Machine Shop & Tool Repair Service, South Holland
- Machine Tool Repair & Rebuild, South Holland
- Machinery And Equipment Manufacturers, South Holland
- Machinery, Supplies & Equipment - Business Production Related, South Holland
- Machinery, Supplies & Equipment - Business Supplies Related, South Holland
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Holland
- Mailbox Rental Services, South Holland
- Mailing, Delivery & Courier Service, South Holland
- Maintenance, Cleaning & Sanitation, South Holland
- Major Appliances, South Holland - Household & Kitchen
- Management Consultants & Services, South Holland
- Manicurists & Pedicurists, South Holland
- Manufacturers Agents & Representatives, South Holland
- Manufacturers Representative, South Holland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, South Holland
- Manufacturing Products, South Holland
- Marriage & Family Counselors, South Holland
- Masonry Materials & Supplies, South Holland
- Material Handling, South Holland
- Material Handling Equipment, South Holland - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, South Holland
- Meat Packers, South Holland
- Medical & Dental Management, South Holland
- Medical & Health Service Organizations, South Holland
- Medical Billing Services, South Holland
- Medical Supplies & Equipment, South Holland
- Mental & Developmental Information & Referral Services, South Holland
- Mental Health Specialists, South Holland - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South Holland
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- Merchandising & Pricing Equipment, South Holland
- Metal Repair Service & Blacksmith, South Holland - Iron Works
- Metal Working Machinery, South Holland
- Mildew Removal & Control, South Holland - Mold Removal
- Mini & Self Storage, South Holland
- Miscellaneous Business Product Repair, South Holland
- Miscellaneous Household Item Repair, South Holland
- Miscellaneous Business Services, South Holland
- Miscellaneous Government, South Holland
- Miscellaneous Manufacturing, South Holland
- Miscellaneous Personal Services, South Holland
- Miscellaneous Photographers, South Holland
- Miscellaneous Professional, South Holland
- Monuments, Tombstones, Markers & Memorials, South Holland
- Motor Vehicle, South Holland
- Motor Vehicle Rental & Leasing, South Holland
- Motorcycle Parts, Accessories & Dealers, South Holland
- Moving & Storage Supplies & Equipment, South Holland
- Moving Companies, South Holland
- Moving Supplies & Equipment Rental, South Holland
- Moving Truck Rental , South Holland
- Muffler Shop & Exhaust Systems, South Holland
- Museums, South Holland
- Music, South Holland
- Musical Instrument Rental, South Holland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, South Holland
- Musical Recording Services, South Holland
- Myofunctional Therapy, South Holland
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