- Machine Shop, New London
- Machinery, Supplies & Equipment - Business Supplies Related, New London
- Machinery, Supplies & Equipment - Construction & Contractor Related, New London
- Manufacturing, New London
- Manufacturing Products, New London
- Marriage & Family Counselors, New London
- Masonry Contractors, New London - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, New London
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- Men's Clothing Stores, New London - Clothes & Accessories
- Mental Health Specialists, New London - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, New London
- Miscellaneous Government, New London
- Mortgage Bankers & Correspondents, New London
- Motor Vehicle, New London
- Movie Theaters, New London
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