- Machine Shop & Tool Repair Service, Greenlawn
- Machinery, Supplies & Equipment - Business Supplies Related, Greenlawn
- Management Consultants & Services, Greenlawn
- Manicurists & Pedicurists, Greenlawn
- Manufacturing, Greenlawn
- Manufacturing & Industrial Consultants, Greenlawn
- Marine Supplies & Equipment, Greenlawn - Boat Supplies
- Marine Surveyors & Adjustors, Greenlawn
- Martial Arts & Self Defense Schools, Greenlawn
- Masonry Contractors, Greenlawn - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Greenlawn
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- Membership Sports & Recreation Clubs, Greenlawn
- Metal Repair Service & Blacksmith, Greenlawn - Iron Works
- Mexican Restaurants, Greenlawn
- Miscellaneous Agriculture, Greenlawn
- Miscellaneous Government, Greenlawn
- Miscellaneous Personal Services, Greenlawn
- Miscellaneous Professional, Greenlawn
- Mortgage Bankers & Correspondents, Greenlawn
- Motor Vehicle, Greenlawn
- Museums, Greenlawn
- Music, Greenlawn
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