- Machine Shop & Tool Repair Service, Nitro
- Machine Tools , Nitro
- Machinery, Supplies & Equipment - Business Production Related, Nitro
- Machinery, Supplies & Equipment - Business Supplies Related, Nitro
- Machinery, Supplies & Equipment - Construction & Contractor Related, Nitro
- Mail Delivery Service, Nitro
- Mailing, Delivery & Courier Service, Nitro
- Maintenance, Cleaning & Sanitation, Nitro
- Major Appliances, Nitro - Household & Kitchen
- Management Consultants & Services, Nitro
- Manicurists & Pedicurists, Nitro
- Manufacturing, Nitro
- Manufacturing Products, Nitro
- Markets & Grocers Equipment, Nitro
- Marriage & Family Counselors, Nitro
- Martial Arts & Self Defense Schools, Nitro
- Masonry Materials & Supplies, Nitro
- Mechanical Contractors, Nitro - Install, Service & Repair
- Medical Supplies & Equipment, Nitro
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- Methodist Church, Nitro
- Mexican Restaurants, Nitro
- Mildew Removal & Control, Nitro - Mold Removal
- Mining, Nitro
- Mining Consultants, Nitro
- Mining Contractors, Nitro - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Nitro
- Mining Equipment & Supplies Service & Repair, Nitro
- Mining Services, Nitro
- Mining, Crude-Oil Production, Nitro - Mining Companies
- Miscellaneous Government, Nitro
- Miscellaneous Personal Services, Nitro
- Modular & Mobile Homes For Sale, Nitro - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Nitro
- Motor Vehicle, Nitro
- Motor Vehicle Rental & Leasing, Nitro
- Moving Companies, Nitro
- Moving Truck Rental , Nitro
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