- Machine Shop & Tool Repair Service, Petersburg
- Machinery, Supplies & Equipment - Business Supplies Related, Petersburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Petersburg
- Maintenance, Cleaning & Sanitation, Petersburg
- Major Appliances, Petersburg - Household & Kitchen
- Management Consultants & Services, Petersburg
- Manufacturing, Petersburg
- Masonry Materials & Supplies, Petersburg
- Mechanical Contractors, Petersburg - Install, Service & Repair
- Medical Supplies & Equipment, Petersburg
- Mennonite Church, Petersburg
- Mental Health Clinics, Petersburg - Treatment Centers
- Mental Retardation & Developmentally Disabled Services, Petersburg
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- Methodist Church, Petersburg
- Mildew Removal & Control, Petersburg - Mold Removal
- Mini & Self Storage, Petersburg
- Miscellaneous Business Services, Petersburg
- Miscellaneous Government, Petersburg
- Miscellaneous Personal Services, Petersburg
- Miscellaneous Professional, Petersburg
- Monuments, Tombstones, Markers & Memorials, Petersburg
- Mortgage Bankers & Correspondents, Petersburg
- Motor Vehicle, Petersburg
- Motor Vehicle Rental & Leasing, Petersburg
- Motorcycle Parts, Accessories & Dealers, Petersburg
- Moving Truck Rental , Petersburg
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