- Machine Shop, Arlington
- Machine Shop & Tool Repair Service, Arlington
- Machine Tools , Arlington
- Machinery And Equipment Manufacturers, Arlington
- Machinery Custom Design Manufacturers, Arlington
- Machinery Repair & Rebuild, Arlington
- Machinery, Supplies & Equipment - Business Production Related, Arlington
- Machinery, Supplies & Equipment - Business Supplies Related, Arlington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Arlington
- Mail Delivery Service, Arlington
- Mailbox Rental Services, Arlington
- Mailing, Delivery & Courier Service, Arlington
- Major Appliances, Arlington - Household & Kitchen
- Make Up & Cosmetics Application, Arlington
- Management Consultants & Services, Arlington
- Manicurists & Pedicurists, Arlington
- Manufacturers Agents & Representatives, Arlington
- Manufacturers Representative, Arlington - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Arlington
- Manufacturing Products, Arlington
- Manufacturing Services, Arlington
- Marine Electronic Equipment, Arlington
- Marine Electronics, Arlington
- Marine Hardware, Arlington
- Marine Products And Services, Arlington
- Marriage & Family Counselors, Arlington
- Martial Arts & Self Defense Schools, Arlington
- Masonry Materials & Supplies, Arlington
- Massage Therapists & Professional, Arlington
- Massage Therapy, Arlington
- Material Handling Equipment, Arlington - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical & Dental Management, Arlington
- Medical & Infectious Waste Disposal, Arlington
- Medical Groups & Clinics, Arlington - Medical & Health Centers
- Medical Massage, Arlington
- Medical Supplies & Equipment, Arlington
- Meeting & Event Planning Services, Arlington - Conference Consultants
- Membership Sports & Recreation Clubs, Arlington
- Mental Health Specialists, Arlington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Arlington
- Merchandising & Pricing Equipment, Arlington
- Metal Buildings, Arlington - Kits, Homes, Steel Buildings, etc
- Metal Cleaning & Pickling, Arlington
- Metal Coating & Allied Services, Arlington
- Metal Deburring, Arlington
- Metal Plating & Polishing, Arlington
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- Metal Polishing & Buffing, Arlington
- Metal Repair Service & Blacksmith, Arlington - Iron Works
- Metal Roll Forming Manufacturers, Arlington
- Methodist Church, Arlington
- Mexican Restaurants, Arlington
- Midwives, Arlington
- Millwork Contractors, Arlington
- Mini & Self Storage, Arlington
- Mining, Arlington
- Mining Equipment & Supplies, Arlington
- Mining Equipment & Supplies Service & Repair, Arlington
- Ministries Church, Arlington
- Miscellaneous Business Manufacturing, Arlington
- Miscellaneous Household Item Repair, Arlington
- Miscellaneous Agriculture, Arlington
- Miscellaneous Business Services, Arlington
- Miscellaneous Government, Arlington
- Miscellaneous Industry, Arlington
- Miscellaneous Manufacturing, Arlington
- Miscellaneous Metal Work Manufacturers, Arlington
- Miscellaneous Personal Services, Arlington
- Miscellaneous Photographers, Arlington
- Miscellaneous Professional, Arlington
- Mobile Home Parks & Communities , Arlington
- Modular & Mobile Homes For Sale, Arlington - Manufactured Homes Sale & Service
- Moldings Materials, Arlington
- Molds, Arlington
- Mortgage Bankers & Correspondents, Arlington
- Mortgages & Loans, Arlington
- Motion Picture & Television Production Services, Arlington
- Motor Vehicle, Arlington
- Motor Vehicle Rental & Leasing, Arlington
- Motorcycle & ATV Repair & Service, Arlington
- Motorcycle Driving School, Arlington
- Motorcycle Parts, Accessories & Dealers, Arlington
- Motorcycle Repair & Service, Arlington
- Moving Supplies & Equipment Rental, Arlington
- Moving Truck Rental , Arlington
- Mowing Service, Arlington
- Muffler Shop & Exhaust Systems, Arlington
- Museums, Arlington
- Music, Arlington
- Musical Instrument Manufacturers, Arlington
- Musical Instruments & Equipment Stores, Arlington
- Musical Recording Services, Arlington
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