- Machine Shop & Tool Repair Service, Southampton
- Machine Tools , Southampton
- Machinery And Equipment Manufacturers, Southampton
- Machinery Custom Design Manufacturers, Southampton
- Machinery, Supplies & Equipment - Business Production Related, Southampton
- Machinery, Supplies & Equipment - Business Supplies Related, Southampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southampton
- Magazine Ads, Southampton - Periodical Advertising
- Mailbox Rental Services, Southampton
- Mailing, Delivery & Courier Service, Southampton
- Major Appliances, Southampton - Household & Kitchen
- Malls & Shopping Centers, Southampton
- Management Consultants & Services, Southampton
- Manicurists & Pedicurists, Southampton
- Manufacturing, Southampton
- Manufacturing Products, Southampton
- Marine Products And Services, Southampton
- Marine Services, Southampton
- Market Research & Analysis , Southampton - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Southampton
- Masonry Contractors, Southampton - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Southampton
- Massage Therapy, Southampton
- Mastectomy Apparel, Forms, Prostheses & Supplies, Southampton
- Mechanical Contractors, Southampton - Install, Service & Repair
- Medical & Health Service Organizations, Southampton
- Medical & Infectious Waste Disposal, Southampton
- Medical Diagnostic Clinics, Southampton - Clinical Labs & Centers
- Medical Supplies & Equipment, Southampton
- Membership Sports & Recreation Clubs, Southampton
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- Mennonite Church, Southampton
- Mental Health Specialists, Southampton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Southampton - Iron Works
- Metal Stampings Manufacturers, Southampton
- Metal Working Machinery, Southampton
- Mexican Restaurants, Southampton
- Mini & Self Storage, Southampton
- Ministries Church, Southampton
- Miscellaneous Household Item Repair, Southampton
- Miscellaneous Government, Southampton
- Miscellaneous Metal Work Manufacturers, Southampton
- Miscellaneous Personal Services, Southampton
- Miscellaneous Photographers, Southampton
- Miscellaneous Professional, Southampton
- Monuments, Tombstones, Markers & Memorials, Southampton
- Mortgage Bankers & Correspondents, Southampton
- Mortgage Companies, Southampton
- Mortgages & Loans, Southampton
- Motion Picture Pre & Post Production Services, Southampton
- Motor Vehicle, Southampton
- Motor Vehicle Rental & Leasing, Southampton
- Moving & Storage Supplies & Equipment, Southampton
- Moving Companies, Southampton
- Moving Services - Labor & Material, Southampton
- Moving Supplies & Equipment Rental, Southampton
- Moving Truck Rental , Southampton
- Muffler Shop & Exhaust Systems, Southampton
- Music, Southampton
- Music Schools, Southampton
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