- Machinery, Supplies & Equipment - Business Supplies Related, Seaford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Seaford
- Mail Delivery Service, Seaford
- Mail Receiving & Forwarding Service, Seaford
- Major Appliances, Seaford - Household & Kitchen
- Management Consultants & Services, Seaford
- Manicurists & Pedicurists, Seaford
- Manufacturers Agents & Representatives, Seaford
- Manufacturing, Seaford
- Manufacturing Products, Seaford
- Marble Contractors, Seaford - Installation, Cleaning & Removal Services
- Marinas & Marina Services, Seaford
- Marine Lifts, Launching & Recovery, Seaford
- Marine Products And Services, Seaford
- Marine Repair & Service Stations, Seaford
- Marine Services, Seaford
- Marine Supplies & Equipment, Seaford - Boat Supplies
- Marine Supplies & Equipment Repair, Seaford - Boat Supplies & Equipment
- Marketing Consultants Professional Practices, Seaford
- Marriage & Family Counselors, Seaford
- Martial Arts & Self Defense Schools, Seaford
- Masonry Contractors, Seaford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Seaford
- Meat Market, Wholesale & Products, Seaford
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- Medical Diagnostic Clinics, Seaford - Clinical Labs & Centers
- Medical Research, Seaford
- Medical Research & Development, Seaford - Medical Information & Research
- Medical Supplies & Equipment, Seaford
- Mental Health Specialists, Seaford - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Stampings Manufacturers, Seaford
- Mexican Restaurants, Seaford
- Miscellaneous Household Item Repair, Seaford
- Miscellaneous Business Services, Seaford
- Miscellaneous Government, Seaford
- Miscellaneous Manufacturing, Seaford
- Miscellaneous Metal Work Manufacturers, Seaford
- Miscellaneous Personal Services, Seaford
- Miscellaneous Photographers, Seaford
- Miscellaneous Professional, Seaford
- Motion Picture Pre & Post Production Services, Seaford
- Motion Pictures Video Tape Duplication & Transfer Services, Seaford
- Motor Vehicle, Seaford
- Motor Vehicle Rental & Leasing, Seaford
- Movie Theaters, Seaford
- Moving & Storage Supplies & Equipment, Seaford
- Moving Companies, Seaford
- Moving Supplies & Equipment Rental, Seaford
- Moving Truck Rental , Seaford
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