- Machine Shop & Tool Repair Service, Seaford
- Machine Tools , Seaford
- Machinery, Supplies & Equipment - Business Production Related, Seaford
- Machinery, Supplies & Equipment - Business Supplies Related, Seaford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Seaford
- Mailbox Rental Services, Seaford
- Mailing, Delivery & Courier Service, Seaford
- Management Consultants & Services, Seaford
- Manicurists & Pedicurists, Seaford
- Manifold Business Forms Manufacturers, Seaford
- Manufacturing, Seaford
- Manufacturing Products, Seaford
- Marinas & Marina Services, Seaford
- Marine Contractors & Designers, Seaford
- Marriage & Family Counselors, Seaford
- Martial Arts & Self Defense Schools, Seaford
- Masonry Materials & Supplies, Seaford
- Massage Therapists & Professional, Seaford
- Massage Therapy, Seaford
- Material Handling, Seaford
- Mats & Matting, Seaford
- Meat Market, Wholesale & Products, Seaford
- Mechanical Contractors, Seaford - Install, Service & Repair
- Medical & Dental Assistant Schools, Seaford
- Medical & Health Service Organizations, Seaford
- Medical Groups & Clinics, Seaford - Medical & Health Centers
- Medical Supplies & Equipment, Seaford
- Membership Sports & Recreation Clubs, Seaford
- Mental Health Clinics, Seaford - Treatment Centers
- Mental Health Specialists, Seaford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Seaford
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- Metal Buildings, Seaford - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Seaford
- Metal Lockers, Seaford
- Metal Products, Seaford
- Methodist Church, Seaford
- Mexican Restaurants, Seaford
- Mini & Self Storage, Seaford
- Mining, Seaford
- Ministries Church, Seaford
- Mirrors, Seaford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Seaford
- Miscellaneous Business Services, Seaford
- Miscellaneous Government, Seaford
- Miscellaneous Industry, Seaford
- Miscellaneous Professional, Seaford
- Mobile Home Parks & Communities , Seaford
- Modular & Mobile Homes For Sale, Seaford - Manufactured Homes Sale & Service
- Money Transfer Service, Seaford
- Mortgage Bankers & Correspondents, Seaford
- Mortgages & Loans, Seaford
- Motor Vehicle, Seaford
- Motor Vehicle Rental & Leasing, Seaford
- Motorcycle & Motor Scooters Dealers, Repair & Service, Seaford
- Motorcycle Repair & Service, Seaford
- Moving & Storage Supplies & Equipment, Seaford
- Moving Companies, Seaford
- Moving Supplies & Equipment Rental, Seaford
- Moving Truck Rental , Seaford
- Mulch, Peat & Moss Products, Seaford
- Museums, Seaford
- Musical Instruments Repair, Sales & Service, Seaford
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