- Machine Shop & Tool Repair Service, Belvidere
- Machinery, Supplies & Equipment - Business Production Related, Belvidere
- Machinery, Supplies & Equipment - Business Supplies Related, Belvidere
- Machinery, Supplies & Equipment - Construction & Contractor Related, Belvidere
- Magazine Ads, Belvidere - Periodical Advertising
- Major Appliances, Belvidere - Household & Kitchen
- Management Consultants & Services, Belvidere
- Manufacturers Agents & Representatives, Belvidere
- Manufacturers Representative, Belvidere - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Belvidere
- Market Research & Analysis , Belvidere - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Belvidere
- Masonry Materials & Supplies, Belvidere
- Medical Diagnostic Clinics, Belvidere - Clinical Labs & Centers
- Medical Supplies & Equipment, Belvidere
- Mental Health Specialists, Belvidere - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Belvidere
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- Methodist Church, Belvidere
- Mini & Self Storage, Belvidere
- Mining, Belvidere
- Miscellaneous Agriculture, Belvidere
- Miscellaneous Government, Belvidere
- Miscellaneous Manufacturing, Belvidere
- Miscellaneous Personal Services, Belvidere
- Miscellaneous Photographers, Belvidere
- Motor Vehicle, Belvidere
- Motor Vehicle Rental & Leasing, Belvidere
- Motorcycle Parts, Accessories & Dealers, Belvidere
- Movie Theaters, Belvidere
- Moving Companies, Belvidere
- Moving Supplies & Equipment Rental, Belvidere
- Moving Truck Rental , Belvidere
- Mulch, Peat & Moss Products, Belvidere
- Museums, Belvidere
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