- Machine Shop & Tool Repair Service, Port Arthur
- Machinery And Equipment Manufacturers, Port Arthur
- Machinery, Supplies & Equipment - Business Production Related, Port Arthur
- Machinery, Supplies & Equipment - Business Supplies Related, Port Arthur
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Arthur
- Mailbox Rental Services, Port Arthur
- Mailing, Delivery & Courier Service, Port Arthur
- Maintenance, Cleaning & Sanitation, Port Arthur
- Major Appliances, Port Arthur - Household & Kitchen
- Malls & Shopping Centers, Port Arthur
- Management Consultants & Services, Port Arthur
- Manicurists & Pedicurists, Port Arthur
- Manufacturers Agents & Representatives, Port Arthur
- Manufacturers Representative, Port Arthur - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Port Arthur
- Manufacturing & Industrial Consultants, Port Arthur
- Manufacturing Equipment & Supplies, Port Arthur
- Manufacturing Products, Port Arthur
- Marinas & Marina Services, Port Arthur
- Marine Contractors & Designers, Port Arthur
- Marine Electronic Equipment, Port Arthur
- Marine Products And Services, Port Arthur
- Marine Repair & Service Stations, Port Arthur
- Marine Services, Port Arthur
- Marine Supplies & Equipment, Port Arthur - Boat Supplies
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Port Arthur
- Marine Supplies & Equipment Repair, Port Arthur - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Port Arthur
- Marriage & Family Counselors, Port Arthur
- Masonry Materials & Supplies, Port Arthur
- Massage Therapists & Professional, Port Arthur
- Massage Therapy, Port Arthur
- Mats & Matting Rental, Port Arthur
- Meat Market, Wholesale & Products, Port Arthur
- Medical Diagnostic Clinics, Port Arthur - Clinical Labs & Centers
- Medical Groups & Clinics, Port Arthur - Medical & Health Centers
- Medical Supplies & Equipment, Port Arthur
- Membership Sports & Recreation Clubs, Port Arthur
- Men's & Boys Clothing & Accessories Stores, Port Arthur
- Men's Clothing Stores, Port Arthur - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Port Arthur
- Mental Health Clinics, Port Arthur - Treatment Centers
- Mental Health Specialists, Port Arthur - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Port Arthur
- Merle Norman Cosmetics, Port Arthur
- Metal Buildings, Port Arthur - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Port Arthur - Iron Works
- Metal Roll Forming Manufacturers, Port Arthur
- Meters Repair, Port Arthur
- Methodist Church, Port Arthur
- Mexican Restaurants, Port Arthur
- Mildew Removal & Control, Port Arthur - Mold Removal
- Mini & Self Storage, Port Arthur
- Mining, Port Arthur
- Mining Contractors, Port Arthur - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Port Arthur - Mining Companies
- Ministries Church, Port Arthur
- Miscellaneous Business Product Repair, Port Arthur
- Miscellaneous Business Services, Port Arthur
- Miscellaneous Government, Port Arthur
- Miscellaneous Manufacturing, Port Arthur
- Miscellaneous Metal Work Manufacturers, Port Arthur
- Miscellaneous Personal Services, Port Arthur
- Miscellaneous Professional, Port Arthur
- Mission Churches, Port Arthur
- Mobile Home Parks & Communities , Port Arthur
- Money Transfer Service, Port Arthur
- Mortgage Bankers & Correspondents, Port Arthur
- Mortgages & Loans, Port Arthur
- Mosquito Control, Port Arthur
- Motor Vehicle, Port Arthur
- Motor Vehicle Rental & Leasing, Port Arthur
- Motorcycle & ATV Repair & Service, Port Arthur
- Motorcycle & Motor Scooters Dealers, Repair & Service, Port Arthur
- Motorcycle Parts, Accessories & Dealers, Port Arthur
- Motorcycle Repair & Service, Port Arthur
- Movie Theaters, Port Arthur
- Moving & Storage Supplies & Equipment, Port Arthur
- Moving Companies, Port Arthur
- Moving Truck Rental , Port Arthur
- Muffler Shop & Exhaust Systems, Port Arthur
- Museums, Port Arthur
- Music, Port Arthur
- Musical Instrument Rental, Port Arthur - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Port Arthur
- Musical Recording Services, Port Arthur
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