- Machine Shop & Tool Repair Service, Southampton
- Machinery And Equipment Manufacturers, Southampton
- Machinery, Supplies & Equipment - Business Production Related, Southampton
- Machinery, Supplies & Equipment - Business Supplies Related, Southampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southampton
- Management Consultants & Services, Southampton
- Manufacturing, Southampton
- Manufacturing & Industrial Consultants, Southampton
- Manufacturing Products, Southampton
- Marriage & Family Counselors, Southampton
- Martial Arts & Self Defense Schools, Southampton
- Masonry Contractors, Southampton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Southampton
- Meat Market, Wholesale & Products, Southampton
- Mechanical Contractors, Southampton - Install, Service & Repair
- Men's & Boys Clothing & Accessories Stores, Southampton
- Mens & Boys Jeans & Western Wear Stores, Southampton
- Merchandise Sales Events, Southampton
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- Metal Repair Service & Blacksmith, Southampton - Iron Works
- Metal Trim, Southampton
- Methodist Church, Southampton
- Mexican Restaurants, Southampton
- Miscellaneous Household Item Repair, Southampton
- Miscellaneous Industry, Southampton
- Miscellaneous Personal Services, Southampton
- Miscellaneous Professional, Southampton
- Mobile Home Parks & Communities , Southampton
- Modular & Mobile Homes For Sale, Southampton - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Southampton
- Motor Vehicle, Southampton
- Motor Vehicle Rental & Leasing, Southampton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Southampton
- Motorcycle Repair & Service, Southampton
- Moving Supplies & Equipment Rental, Southampton
- Moving Truck Rental , Southampton
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