- Machine Shop, Houlton
- Machinery And Equipment Manufacturers, Houlton
- Machinery, Supplies & Equipment - Business Supplies Related, Houlton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Houlton
- Major Appliances, Houlton - Household & Kitchen
- Management Consultants & Services, Houlton
- Manufactured & Mobile Home Movers & Transporting, Houlton
- Manufacturing, Houlton
- Manufacturing Products, Houlton
- Marriage & Family Counselors, Houlton
- Masonry Materials & Supplies, Houlton
- Meat Market, Wholesale & Products, Houlton
- Meat Packers, Houlton
- Medical Supplies & Equipment, Houlton
- Mental Health Specialists, Houlton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Houlton
- Methodist Church, Houlton
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- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Houlton
- Miscellaneous Government, Houlton
- Miscellaneous Personal Services, Houlton
- Miscellaneous Professional, Houlton
- Modular & Mobile Homes For Sale, Houlton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Houlton
- Motor Vehicle, Houlton
- Motor Vehicle Rental & Leasing, Houlton
- Motorcycle Parts, Accessories & Dealers, Houlton
- Movie Theaters, Houlton
- Moving & Storage Supplies & Equipment, Houlton
- Moving Truck Rental , Houlton
- Music, Houlton
- Musical Instrument Manufacturers, Houlton
- Musical Instruments & Equipment Stores, Houlton
- Musical Instruments Supplies & Accessories Manufacturers, Houlton
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