- Machine Shop & Tool Repair Service, Rockford
- Machinery And Equipment Manufacturers, Rockford
- Machinery Custom Design Manufacturers, Rockford
- Machinery, Supplies & Equipment - Business Production Related, Rockford
- Machinery, Supplies & Equipment - Business Supplies Related, Rockford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Rockford
- Magicians & Hypnotist Entertainers, Rockford
- Maintenance, Cleaning & Sanitation, Rockford
- Management Consultants & Services, Rockford
- Manicurists & Pedicurists, Rockford
- Manufacturers Agents & Representatives, Rockford
- Manufacturers Representative, Rockford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Rockford
- Marine Contractors & Designers, Rockford
- Marine Products And Services, Rockford
- Marine Repair & Service Stations, Rockford
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Rockford
- Marine Supplies & Equipment Repair, Rockford - Boat Supplies & Equipment
- Marriage & Family Counselors, Rockford
- Masonry Contractors, Rockford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Rockford
- Material Handling Equipment, Rockford - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Rockford
- Mechanical Contractors, Rockford - Install, Service & Repair
- Mechanical Engineer, Rockford - Mechanical Engineering Service
- Medical Groups & Clinics, Rockford - Medical & Health Centers
- Medical Supplies & Equipment, Rockford
- Mental Health Specialists, Rockford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Rockford
- Metal Buildings, Rockford - Wood Buildings
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- Metal Buildings, Rockford - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Rockford
- Methodist Church, Rockford
- Mexican Restaurants, Rockford
- Mildew Removal & Control, Rockford - Mold Removal
- Miscellaneous Business Product Repair, Rockford
- Miscellaneous Government, Rockford
- Miscellaneous Industry, Rockford
- Miscellaneous Manufacturing, Rockford
- Miscellaneous Personal Services, Rockford
- Miscellaneous Photographers, Rockford
- Miscellaneous Professional, Rockford
- Mission Churches, Rockford
- Mobile Home Parks & Communities , Rockford
- Moldings Materials, Rockford
- Molds, Rockford
- Mortgage Bankers & Correspondents, Rockford
- Mortgage Loan Processors, Rockford
- Motor Vehicle, Rockford
- Motor Vehicle Rental & Leasing, Rockford
- Moving Companies, Rockford
- Moving Supplies & Equipment Rental, Rockford
- Moving Truck Rental , Rockford
- Muffler Shop & Exhaust Systems, Rockford
- Mulch, Peat & Moss Products, Rockford
- Museums, Rockford
- Music, Rockford
- Musical Instruments & Equipment Stores, Rockford
- Musical Recording Services, Rockford
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