- Machine Shop, Arlington
- Machinery, Supplies & Equipment - Business Production Related, Arlington
- Machinery, Supplies & Equipment - Business Supplies Related, Arlington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Arlington
- Mailbox Rental Services, Arlington
- Mailing, Delivery & Courier Service, Arlington
- Major Appliances, Arlington - Household & Kitchen
- Management Consultants & Services, Arlington
- Manicurists & Pedicurists, Arlington
- Manufacturing, Arlington
- Market Research & Analysis , Arlington - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Arlington
- Marriage & Family Counselors, Arlington
- Martial Arts & Self Defense Schools, Arlington
- Masonry Contractors, Arlington - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Arlington
- Massage Therapy, Arlington
- Material Handling & Heavy Machinery & Equipment, Arlington
- Medical Diagnostic Clinics, Arlington - Clinical Labs & Centers
- Medical Groups & Clinics, Arlington - Medical & Health Centers
- Medical Supplies & Equipment, Arlington
- Membership Organizations, Arlington
- Mental Health Clinics, Arlington - Treatment Centers
- Mental Health Specialists, Arlington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Arlington
- Metaphysical Churches, Arlington
- Methodist Church, Arlington
- Mexican Restaurants, Arlington
- Middle Eastern Restaurants, Arlington
- Mini & Self Storage, Arlington
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- Miscellaneous Business Product Repair, Arlington
- Miscellaneous Household Item Repair, Arlington
- Miscellaneous Business Services, Arlington
- Miscellaneous Government, Arlington
- Miscellaneous Manufacturing, Arlington
- Miscellaneous Personal Services, Arlington
- Miscellaneous Photographers, Arlington
- Miscellaneous Professional, Arlington
- Mortgage Bankers & Correspondents, Arlington
- Mortgage Companies, Arlington
- Motion Picture & Television Production Services, Arlington
- Motion Picture Pre & Post Production Services, Arlington
- Motor Vehicle, Arlington
- Motor Vehicle Rental & Leasing, Arlington
- Motorcycle & Motor Scooters Dealers, Repair & Service, Arlington
- Motorcycle Repair & Service, Arlington
- Movie Theaters, Arlington
- Moving & Storage Supplies & Equipment, Arlington
- Moving Companies, Arlington
- Moving Truck Rental , Arlington
- Muffler Shop & Exhaust Systems, Arlington
- Museums, Arlington
- Music, Arlington
- Music Entertainment, Arlington
- Music Schools, Arlington
- Musical Instrument Rental, Arlington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Arlington
- Musical Instruments Repair, Sales & Service, Arlington
- Musical Recording Services, Arlington
- Musicians, Bands & Disc Jockeys, Arlington
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