- Machine Shop, Dublin
- Machine Shop & Tool Repair Service, Dublin
- Machine Tools , Dublin
- Machinery And Equipment Manufacturers, Dublin
- Machinery, Supplies & Equipment - Business Production Related, Dublin
- Machinery, Supplies & Equipment - Business Supplies Related, Dublin
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dublin
- Magazine & Newspaper Stands, Dublin - Dealers & Distributors
- Mailbox Rental Services, Dublin
- Mailing, Delivery & Courier Service, Dublin
- Major Appliances, Dublin - Household & Kitchen
- Management Consultants & Services, Dublin
- Manicurists & Pedicurists, Dublin
- Manufacturers Agents & Representatives, Dublin
- Manufacturers Representative, Dublin - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Dublin
- Manufacturing Products, Dublin
- Marble, Dublin
- Market Research & Analysis , Dublin - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Dublin
- Marriage & Family Counselors Information & Referrals, Dublin
- Martial Arts & Self Defense Schools, Dublin
- Mary Kay Cosmetics, Dublin
- Masonry Materials & Supplies, Dublin
- Massage Therapists & Professional, Dublin
- Massage Therapy, Dublin
- Mechanical Contractors, Dublin - Install, Service & Repair
- Mechanical Engineer, Dublin - Mechanical Engineering Service
- Medical & Dental Management, Dublin
- Medical Alert Systems, Dublin - Medical Alarms - PERS
- Medical Business Management Services, Dublin
- Medical Groups & Clinics, Dublin - Medical & Health Centers
- Medical Management & Business Administration Service, Dublin
- Medical Supplies & Equipment, Dublin
- Men's Clothing Stores, Dublin - Clothes & Accessories
- Men's Shoe Stores, Dublin
- Mental Health Specialists, Dublin - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Dublin
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- Merchandising & Pricing Equipment, Dublin
- Mexican Restaurants, Dublin
- Middle Eastern Restaurants, Dublin
- Millwork Manufacturers, Dublin
- Mini & Self Storage, Dublin
- Mining, Dublin
- Mirrors, Dublin - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Dublin
- Miscellaneous Business Services, Dublin
- Miscellaneous Government, Dublin
- Miscellaneous Manufacturing, Dublin
- Miscellaneous Photographers, Dublin
- Miscellaneous Professional, Dublin
- Moldings Materials, Dublin
- Mongolian Restaurants, Dublin
- Mortgage Bankers & Correspondents, Dublin
- Mortgage Companies, Dublin
- Mortgages & Loans, Dublin
- Motion Picture & Television Production Services, Dublin
- Motion Pictures Video Tape Duplication & Transfer Services, Dublin
- Motor Vehicle, Dublin
- Motor Vehicle Rental & Leasing, Dublin
- Motorcycle Parts, Accessories & Dealers, Dublin
- Movie Theaters, Dublin
- Moving & Storage Supplies & Equipment, Dublin
- Moving Companies, Dublin
- Moving Truck Rental , Dublin
- Muffler Shop & Exhaust Systems, Dublin
- Murals & Faux Finish Walls, Dublin
- Music, Dublin
- Music Entertainment, Dublin
- Music Lessons, Dublin
- Music Lessons - Instrumental, Dublin
- Musical Instrument Rental, Dublin - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Dublin
- Musical Instruments - Guitars, Dublin
- Musical Instruments Repair, Sales & Service, Dublin
- Musicians, Bands & Disc Jockeys, Dublin
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