- Machine Shop & Tool Repair Service, Southampton
- Machinery, Supplies & Equipment - Business Production Related, Southampton
- Machinery, Supplies & Equipment - Business Supplies Related, Southampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southampton
- Magazine & Newspaper Stands, Southampton - Dealers & Distributors
- Mailbox Rental Services, Southampton
- Mailing, Delivery & Courier Service, Southampton
- Maintenance, Cleaning & Sanitation, Southampton
- Major Appliances, Southampton - Household & Kitchen
- Management Consultants & Services, Southampton
- Manicurists & Pedicurists, Southampton
- Manufacturers Agents & Representatives, Southampton
- Manufacturing, Southampton
- Manufacturing & Industrial Consultants, Southampton
- Manufacturing Products, Southampton
- Marble, Southampton
- Marble Contractors, Southampton - Installation, Cleaning & Removal Services
- Marble Tile, Southampton
- Marinas & Marina Services, Southampton
- Marine Contractors & Designers, Southampton
- Marine Supplies & Equipment, Southampton - Boat Supplies
- Marriage & Family Counselors, Southampton
- Masonry Contractors, Southampton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Southampton
- Massage Therapy, Southampton
- Maternity Clothes & Clothing Stores, Southampton - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Southampton
- Medical Alert Systems, Southampton - Medical Alarms - PERS
- Medical Diagnostic Clinics, Southampton - Clinical Labs & Centers
- Medical Supplies & Equipment, Southampton
- Medical Transcription Service, Southampton
- Membership Sports & Recreation Clubs, Southampton
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- Men's Clothing Stores, Southampton - Clothes & Accessories
- Mental Health Specialists, Southampton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Southampton - Iron Works
- Metal Tablets, Southampton
- Metal Working Machinery, Southampton
- Methodist Church, Southampton
- Mexican Restaurants, Southampton
- Middle Eastern Restaurants, Southampton
- Mildew Removal & Control, Southampton - Mold Removal
- Mini & Self Storage, Southampton
- Mirrors, Southampton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Services, Southampton
- Miscellaneous Government, Southampton
- Miscellaneous Manufacturing, Southampton
- Miscellaneous Personal Services, Southampton
- Miscellaneous Photographers, Southampton
- Miscellaneous Professional, Southampton
- Modular & Mobile Homes For Sale, Southampton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Southampton
- Mortgage Bankers & Correspondents, Southampton
- Mosquito Control, Southampton
- Motor Vehicle, Southampton
- Motor Vehicle Rental & Leasing, Southampton
- Motorcycle Parts, Accessories & Dealers, Southampton
- Movie Theaters, Southampton
- Moving & Storage Consultants, Southampton
- Moving & Storage Supplies & Equipment, Southampton
- Moving Companies, Southampton
- Moving Supplies & Equipment Rental, Southampton
- Moving Truck Rental , Southampton
- Muffler Shop & Exhaust Systems, Southampton
- Museums, Southampton
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