- Machine Shop, North Dinwiddie
- Machinery, Supplies & Equipment - Business Supplies Related, North Dinwiddie
- Machinery, Supplies & Equipment - Construction & Contractor Related, North Dinwiddie
- Major Appliances, North Dinwiddie - Household & Kitchen
- Manufacturing, North Dinwiddie
- Manufacturing Products, North Dinwiddie
- Marriage & Family Counselors, North Dinwiddie
- Masonry Contractors, North Dinwiddie - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, North Dinwiddie
- Mental Health Specialists, North Dinwiddie - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Roofs, North Dinwiddie
- Methodist Church, North Dinwiddie
- Mexican Restaurants, North Dinwiddie
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- Miscellaneous Government, North Dinwiddie
- Miscellaneous Personal Services, North Dinwiddie
- Miscellaneous Professional, North Dinwiddie
- Mobile Home Parks & Communities , North Dinwiddie
- Model Car Racing Centers, North Dinwiddie
- Mortgage Bankers & Correspondents, North Dinwiddie
- Mortgages & Loans, North Dinwiddie
- Motor Vehicle, North Dinwiddie
- Moving & Storage Consultants, North Dinwiddie
- Moving Companies, North Dinwiddie
- Muffler Shop & Exhaust Systems, North Dinwiddie
- Museums, North Dinwiddie
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