- Machine Shop, Petersburg
- Machine Shop & Tool Repair Service, Petersburg
- Machinery And Equipment Manufacturers, Petersburg
- Machinery Movers & Erectors, Petersburg
- Machinery, Supplies & Equipment - Business Production Related, Petersburg
- Machinery, Supplies & Equipment - Business Supplies Related, Petersburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Petersburg
- Magazine & Newspaper Stands, Petersburg - Dealers & Distributors
- Mail Delivery Service, Petersburg
- Mailing, Delivery & Courier Service, Petersburg
- Major Appliances, Petersburg - Household & Kitchen
- Malpractice Attorneys & Lawyers, Petersburg
- Malpractice Lawyers & Attorneys, Petersburg
- Management Consultants & Services, Petersburg
- Manicurists & Pedicurists, Petersburg
- Manufacturers Agents & Representatives, Petersburg
- Manufacturers Representative, Petersburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Petersburg
- Manufacturing Products, Petersburg
- Marriage & Family Counselors, Petersburg
- Masonry Materials & Supplies, Petersburg
- Massage Therapists & Professional, Petersburg
- Massage Therapy, Petersburg
- Meat Brokers, Petersburg
- Meat Packers, Petersburg
- Medical & Dental Management, Petersburg
- Medical Supplies & Equipment, Petersburg
- Membership Sports & Recreation Clubs, Petersburg
- Men's Clothing Stores, Petersburg - Clothes & Accessories
- Mental Health Specialists, Petersburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Galvanizing, Petersburg
- Metal Stampings Manufacturers, Petersburg
- Methodist Church, Petersburg
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- Mexican Restaurants, Petersburg
- Midwives, Petersburg
- Military Supplies, Petersburg
- Mini & Self Storage, Petersburg
- Ministries Church, Petersburg
- Miscellaneous Household Item Repair, Petersburg
- Miscellaneous Business Services, Petersburg
- Miscellaneous Government, Petersburg
- Miscellaneous Manufacturing, Petersburg
- Miscellaneous Metal Work Manufacturers, Petersburg
- Miscellaneous Personal Services, Petersburg
- Miscellaneous Professional, Petersburg
- Mobile Home Parks & Communities , Petersburg
- Mobile Homes for Rent & Lease, Petersburg
- Modular & Mobile Homes For Sale, Petersburg - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Petersburg
- Mortgage Bankers & Correspondents, Petersburg
- Mortgage Companies, Petersburg
- Mortgages & Loans, Petersburg
- Motor Vehicle, Petersburg
- Motor Vehicle Rental & Leasing, Petersburg
- Movie Theaters, Petersburg
- Moving Companies, Petersburg
- Moving Truck Rental , Petersburg
- Multimedia Publishers, Petersburg - Multimedia Services & Systems
- Museums, Petersburg
- Music, Petersburg
- Music Entertainment, Petersburg
- Music Lessons, Petersburg
- Music Lessons - Instrumental, Petersburg
- Musical Instruments & Equipment Stores, Petersburg
- Musical Instruments Repair, Sales & Service, Petersburg
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