- Machine Shop & Tool Repair Service, Swansea
- Machinery, Supplies & Equipment - Business Production Related, Swansea
- Machinery, Supplies & Equipment - Business Supplies Related, Swansea
- Machinery, Supplies & Equipment - Construction & Contractor Related, Swansea
- Magazine & Newspaper Stands, Swansea - Dealers & Distributors
- Mailing, Delivery & Courier Service, Swansea
- Major Appliances, Swansea - Household & Kitchen
- Malls & Shopping Centers, Swansea
- Management Consultants & Services, Swansea
- Manicurists & Pedicurists, Swansea
- Manufacturers Agents & Representatives, Swansea
- Manufacturers Representative, Swansea - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Swansea
- Manufacturing Products, Swansea
- Marine Products And Services, Swansea
- Marine Repair & Service Stations, Swansea
- Marine Supplies & Equipment Repair, Swansea - Boat Supplies & Equipment
- Marriage & Family Counselors, Swansea
- Masonry Materials & Supplies, Swansea
- Massage Therapists & Professional, Swansea
- Massage Therapy, Swansea
- Mastectomy Apparel, Forms, Prostheses & Supplies, Swansea
- Maternity Clothes & Clothing Stores, Swansea - Maternity Dress, Gown, Swimwear, Underwear & More
- Medical Diagnostic Clinics, Swansea - Clinical Labs & Centers
- Medical Groups & Clinics, Swansea - Medical & Health Centers
- Medical Supplies & Equipment, Swansea
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- Men's Clothing Stores, Swansea - Clothes & Accessories
- Mental Health Specialists, Swansea - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Manufacturing, Swansea
- Miscellaneous Personal Services, Swansea
- Miscellaneous Photographers, Swansea
- Miscellaneous Professional, Swansea
- Mortgage Bankers & Correspondents, Swansea
- Motor Vehicle, Swansea
- Motor Vehicle Rental & Leasing, Swansea
- Motorcycle & Motor Scooters Dealers, Repair & Service, Swansea
- Motorcycle Parts, Accessories & Dealers, Swansea
- Motorcycle Repair & Service, Swansea
- Movie Theaters, Swansea
- Moving & Storage Supplies & Equipment, Swansea
- Moving Companies, Swansea
- Moving Truck Rental , Swansea
- Muffler Shop & Exhaust Systems, Swansea
- Museums, Swansea
- Music, Swansea
- Music Entertainment, Swansea
- Music Lessons, Swansea
- Music Lessons - Instrumental, Swansea
- Music Lessons - Vocal, Swansea
- Musical Instrument Rental, Swansea - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Swansea
- Musicians, Bands & Disc Jockeys, Swansea
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