- Machine Shop, Saco
- Machinery, Supplies & Equipment - Business Production Related, Saco
- Machinery, Supplies & Equipment - Construction & Contractor Related, Saco
- Mailbox Rental Services, Saco
- Mailing, Delivery & Courier Service, Saco
- Major Appliances, Saco - Household & Kitchen
- Management Consultants & Services, Saco
- Manicurists & Pedicurists, Saco
- Manufacturing, Saco
- Manufacturing Products, Saco
- Marinas & Marina Services, Saco
- Marine & Lake Services, Saco
- Marriage & Family Counselors, Saco
- Masonry Contractors, Saco - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Saco
- Massage Therapists & Professional, Saco
- Massage Therapy, Saco
- Material Handling & Heavy Machinery & Equipment, Saco
- Mechanical Engineer, Saco - Mechanical Engineering Service
- Medical Billing Services, Saco
- Medical Groups & Clinics, Saco - Medical & Health Centers
- Medical Supplies & Equipment, Saco
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- Membership Sports & Recreation Clubs, Saco
- Mental Health Specialists, Saco - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Saco
- Metal Finishers, Saco
- Metal Plating & Polishing, Saco
- Metal Repair Service & Blacksmith, Saco - Iron Works
- Metaphysical Churches, Saco
- Methodist Church, Saco
- Mini & Self Storage, Saco
- Miscellaneous Government, Saco
- Miscellaneous Personal Services, Saco
- Miscellaneous Photographers, Saco
- Miscellaneous Professional, Saco
- Modular & Mobile Homes For Sale, Saco - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Saco
- Motor Vehicle, Saco
- Motor Vehicle Rental & Leasing, Saco
- Motorcycle Parts, Accessories & Dealers, Saco
- Movie Theaters, Saco
- Moving & Storage Supplies & Equipment, Saco
- Moving Companies, Saco
- Moving Truck Rental , Saco
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