- Machine Shop & Tool Repair Service, Southampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southampton
- Mail Delivery Service, Southampton
- Major Appliances, Southampton - Household & Kitchen
- Manufacturing, Southampton
- Manufacturing Products, Southampton
- Martial Arts & Self Defense Schools, Southampton
- Masonry Contractors, Southampton - Stone Mason, Brick Mason - Install & Repair
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- Metal Buildings, Southampton - Kits, Homes, Steel Buildings, etc
- Miscellaneous Government, Southampton
- Miscellaneous Photographers, Southampton
- Mortgage Bankers & Correspondents, Southampton
- Motor Vehicle, Southampton
- Motor Vehicle Rental & Leasing, Southampton
- Motorcycle Parts, Accessories & Dealers, Southampton
- Moving Companies, Southampton
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