- Machinery, Supplies & Equipment - Business Production Related, Waldoboro
- Machinery, Supplies & Equipment - Business Supplies Related, Waldoboro
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waldoboro
- Management Consultants & Services, Waldoboro
- Manufacturing, Waldoboro
- Marine Supplies & Equipment, Waldoboro - Boat Supplies
- Masonry Contractors, Waldoboro - Stone Mason, Brick Mason - Install & Repair
- Medical Billing Software, Waldoboro
- Mental Health Specialists, Waldoboro - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Waldoboro
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- Miscellaneous Government, Waldoboro
- Miscellaneous Personal Services, Waldoboro
- Miscellaneous Professional, Waldoboro
- Mobile Homes, Waldoboro
- Mobile Homes Manufactures, Waldoboro
- Modular & Mobile Homes For Sale, Waldoboro - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Waldoboro
- Motor Vehicle, Waldoboro
- Museums, Waldoboro
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