- Machine Shop, Arlington
- Machine Shop & Tool Repair Service, Arlington
- Machine Shop Rotary Surface Grinding, Arlington - Tool Grinding & Sharpening
- Machine Shops Slings, Arlington
- Machine Tool Repair & Rebuild, Arlington
- Machine Tools , Arlington
- Machinery And Equipment 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
- Magazine & Newspaper Stands, Arlington - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Arlington
- Mail Delivery Service, Arlington
- Mailbox Rental Services, Arlington
- Mailing Containers Wholesale & Retail, Arlington
- Mailing List Service, Brokers & Compilers, Arlington
- Mailing, Delivery & Courier Service, Arlington
- Maintenance, Cleaning & Sanitation, Arlington
- Major Appliances, Arlington - Household & Kitchen
- Make Up & Cosmetics Application, Arlington
- Make Up Masquerade & Theatrical, Arlington
- Malls & Shopping Centers, 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 Equipment & Supplies, Arlington
- Manufacturing Products, Arlington
- Manufacturing Services, Arlington
- Marble, Arlington
- Marine Products And Services, Arlington
- Marine Services, Arlington
- Market Research & Analysis , Arlington - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Arlington
- Markets & Grocers Equipment, Arlington
- Marriage & Family Counselors, Arlington
- Martial Arts & Self Defense Schools, Arlington
- Masking & Shipping Tapes, Arlington
- Masonry Contractors, Arlington - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Arlington
- Massage Therapists & Professional, Arlington
- Massage Therapy, Arlington
- Mastectomy Apparel, Forms, Prostheses & Supplies, Arlington
- Material Handling & Heavy Machinery & Equipment, Arlington
- Material Handling Equipment, Arlington - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Arlington - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Arlington
- Meat Packers, Arlington
- Mechanical Contractors, Arlington - Install, Service & Repair
- Mechanical Research & Development, Arlington
- Medical & Dental Assistant Schools, Arlington
- Medical & Dental Management, Arlington
- Medical & Health Service Organizations, Arlington
- Medical Alert Systems, Arlington - Medical Alarms - PERS
- Medical Billing Services, Arlington
- Medical Business Management Services, Arlington
- Medical Diagnostic Clinics, Arlington - Clinical Labs & Centers
- Medical Diagnostic Imaging, Arlington
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Arlington
- Medical Groups & Clinics, Arlington - Medical & Health Centers
- Medical Identification Jewelry, Arlington
- Medical Management & Business Administration Service, Arlington
- Medical Records Service , Arlington
- Medical Research, Arlington
- Medical Research & Development, Arlington - Medical Information & Research
- Medical Supplies & Equipment, Arlington
- Mediterranean Restaurants, Arlington
- Meeting & Event Planning Services, Arlington - Conference Consultants
- Membership Sports & Recreation Clubs, Arlington
- Men's & Boys Clothing & Accessories Stores, Arlington
- Men's Clothing Stores, Arlington - Clothes & Accessories
- Men's Shoe Stores, Arlington
- Mens & Boys Belts & Suspenders, Arlington
- Mens & Boys Hats, Gloves & Neckwear, Arlington
- Mens & Boys Jeans & Western Wear Stores, Arlington
- Mental Health Clinics, Arlington - Treatment Centers
- Mental Health Specialists, Arlington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Arlington
- Merchandising & Marketing Consultants, Arlington
- Merle Norman Cosmetics, Arlington
- Messenger Service, Arlington - Message Receiving & Forwarding Service
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- Metal Buildings, Arlington - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Arlington
- Metal Distributors, Arlington
- Metal Finishers, Arlington
- Metal Heat Treating, Arlington
- Metal Lockers, Arlington
- Metal Plating & Polishing, Arlington
- Metal Repair Service & Blacksmith, Arlington - Iron Works
- Metal Roofs, Arlington
- Metal Stampings Manufacturers, Arlington
- Metal Tanks, Arlington
- Metal Working Machinery, Arlington
- Metaphysical Churches, Arlington
- Methodist Church, Arlington
- Mexican Food, Arlington
- Mexican Restaurants, Arlington
- Microwave Oven Repair & Service, Arlington
- Middle Eastern Restaurants, Arlington
- Millwork Contractors, Arlington
- Mini & Self Storage, Arlington
- Mini Golf Courses, Arlington
- Mining, Arlington
- Ministers, Arlington
- Ministries Church, Arlington
- Mirrors, Arlington - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Arlington
- Miscellaneous Household Item Repair, Arlington
- Miscellaneous Agriculture, Arlington
- Miscellaneous Business Services, Arlington
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, 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
- Mission Churches, Arlington
- Mobile Home Insurance, Arlington
- Mobile Home Parks & Communities , Arlington
- Modular & Mobile Homes For Sale, Arlington - Manufactured Homes Sale & Service
- Modular Buildings, Arlington - Modular Homes Buildings & Offices
- Moldings Materials, Arlington
- Money Brokers, Arlington
- Money Transfer Service, Arlington
- Mongolian Restaurants, Arlington
- Monuments, Tombstones, Markers & Memorials, Arlington
- Mortgage Bankers & Correspondents, Arlington
- Mortgage Brokers, Arlington
- Mortgage Companies, Arlington
- Mortgages & Loans, Arlington
- Mosques, Arlington
- Mosquito Control, Arlington
- Motion Picture & Television Production Services, Arlington
- Motion Picture Pre & Post Production Services, Arlington
- Motion Pictures Video Tape Duplication & Transfer Services, Arlington
- Motivational & Self Improvement Schools, Arlington
- Motor Vehicle, Arlington
- Motor Vehicle Rental & Leasing, Arlington
- Motorcycle Inspection Stations, Arlington
- Motorcycle Parts, Accessories & Dealers, Arlington
- Motorcycle Repair & Service, Arlington
- Motorcycles Paint & Refinishing, Arlington
- Movie Theaters, Arlington
- Moving & Storage Supplies & Equipment, Arlington
- Moving Companies, Arlington
- Moving Supplies & Equipment Rental, Arlington
- Moving Truck Rental , Arlington
- Muffler Shop & Exhaust Systems, Arlington
- Multimedia Publishers, Arlington - Multimedia Services & Systems
- Museums, Arlington
- Music, Arlington
- Music Entertainment, Arlington
- Music Lessons, Arlington
- Music Lessons - Instrumental, Arlington
- Music Lessons - Vocal, Arlington
- Musical Instrument Manufacturers, Arlington
- Musical Instrument Rental, Arlington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Arlington
- Musical Instruments - Guitars, Arlington
- Musical Instruments Repair, Sales & Service, Arlington
- Musical Recording Services, Arlington
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