- Machine Shop & Tool Repair Service, Rockford
- Machine Shop Rotary Surface Grinding, Rockford - Tool Grinding & Sharpening
- Major Appliances, Rockford - Household & Kitchen
- Manufacturing, Rockford
- Manufacturing Products, Rockford
- Marriage & Family Counselors, Rockford
- Massage Therapy, Rockford
- Medical Supplies & Equipment, Rockford
- Mexican Restaurants, Rockford
- Miscellaneous Government, Rockford
- Miscellaneous Manufacturing, Rockford
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- Miscellaneous Professional, Rockford
- Mobile Home Parks & Communities , Rockford
- Modular & Mobile Homes For Sale, Rockford - Manufactured Homes Sale & Service
- Molds, Rockford
- Mortgage Bankers & Correspondents, Rockford
- Mortgage Contracts & Services, Rockford
- Motor Vehicle, Rockford
- Motor Vehicle Rental & Leasing, Rockford
- Moving Truck Rental , Rockford
- Music, Rockford
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