- Machinery, Supplies & Equipment - Business Production Related, Petersburg
- Mail Delivery Service, Petersburg
- Management Consultants & Services, Petersburg
- Manufacturing, Petersburg
- Marine & Lake Services, Petersburg
- Marine Animals & Fish, Petersburg
- Marine Contractors & Designers, Petersburg
- Marine Electronic Equipment, Petersburg
- Marine Products And Services, Petersburg
- Marine Repair & Service Stations, Petersburg
- Marine Supplies & Equipment Repair, Petersburg - Boat Supplies & Equipment
- Masonry Materials & Supplies, Petersburg
- Massage Therapists & Professional, Petersburg
- Massage Therapy, Petersburg
- Meat Market, Wholesale & Products, Petersburg
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- Medical Groups & Clinics, Petersburg - Medical & Health Centers
- Mental Health Specialists, Petersburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Petersburg
- Miscellaneous Business Services, Petersburg
- Miscellaneous Government, Petersburg
- Miscellaneous Photographers, Petersburg
- Miscellaneous Professional, Petersburg
- Mortgage Bankers & Correspondents, Petersburg
- Mortgages & Loans, Petersburg
- Motion Picture & Television Production Services, Petersburg
- Motor Vehicle, Petersburg
- Motor Vehicle Rental & Leasing, Petersburg
- Moving Companies, Petersburg
- Moving Truck Rental , Petersburg
- Museums, Petersburg
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