- Machinery, Supplies & Equipment - Business Production Related, Searsport
- Machinery, Supplies & Equipment - Business Supplies Related, Searsport
- Manufactured & Mobile Home Movers & Transporting, Searsport
- Manufacturing, Searsport
- Manufacturing Products, Searsport
- Marine Pilot & Operator Service, Searsport
- Marine Products And Services, Searsport
- Marine Services, Searsport
- Marine Supplies & Equipment, Searsport - Boat Supplies
- Marine Surveyors & Adjustors, Searsport
- Methodist Church, Searsport
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- Mining, Searsport
- Mining Contractors, Searsport - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Searsport - Mining Companies
- Miscellaneous Government, Searsport
- Mobile Home Parks & Communities , Searsport
- Monuments, Tombstones, Markers & Memorials, Searsport
- Motor Vehicle, Searsport
- Motor Vehicle Rental & Leasing, Searsport
- Moving Truck Rental , Searsport
- Museums, Searsport
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