- Machine Shop, Richardson
- Machine Shop & Tool Repair Service, Richardson
- Machine Tool Repair & Rebuild, Richardson
- Machine Tools , Richardson
- Machinery And Equipment Manufacturers, Richardson
- Machinery Movers & Erectors, Richardson
- Machinery, Supplies & Equipment - Business Production Related, Richardson
- Machinery, Supplies & Equipment - Business Supplies Related, Richardson
- Machinery, Supplies & Equipment - Construction & Contractor Related, Richardson
- Magazine & Newspaper Stands, Richardson - Dealers & Distributors
- Mailbox Rental Services, Richardson
- Mailing, Delivery & Courier Service, Richardson
- Major Appliances, Richardson - Household & Kitchen
- Malls & Shopping Centers, Richardson
- Management Consultants & Services, Richardson
- Manicurists & Pedicurists, Richardson
- Manufacturers Agents & Representatives, Richardson
- Manufacturers Representative, Richardson - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Richardson
- Manufacturing & Industrial Consultants, Richardson
- Manufacturing Equipment & Supplies, Richardson
- Manufacturing Products, Richardson
- Manufacturing Services, Richardson
- Marble, Richardson
- Marble & Terrazzo Flooring - Cleaning & Service, Richardson
- Market Research & Analysis , Richardson - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Richardson
- Marriage & Family Counselors, Richardson
- Marriage & Family Counselors Information & Referrals, Richardson
- Martial Arts & Self Defense Schools, Richardson
- Masonry Materials & Supplies, Richardson
- Massage Therapists & Professional, Richardson
- Massage Therapy, Richardson
- Massage Therapy Relaxation, Richardson
- Mausoleums Developers, Richardson
- Meat Market, Wholesale & Products, Richardson
- Mechanical Contractors, Richardson - Install, Service & Repair
- Medical & Dental Assistant Schools, Richardson
- Medical & Dental Management, Richardson
- Medical & Health Service Organizations, Richardson
- Medical Billing Services, Richardson
- Medical Business Management Services, Richardson
- Medical Claims Processing & Assistance, Richardson
- Medical Diagnostic Clinics, Richardson - Clinical Labs & Centers
- Medical Equipment Manufacturers, Richardson
- Medical Groups & Clinics, Richardson - Medical & Health Centers
- Medical Management & Business Administration Service, Richardson
- Medical Research, Richardson
- Medical Research & Development, Richardson - Medical Information & Research
- Medical Supplies & Equipment, Richardson
- Mediterranean Restaurants, Richardson
- Meeting & Event Planning Services, Richardson - Conference Consultants
- Membership Sports & Recreation Clubs, Richardson
- Men's Shoe Stores, Richardson
- Mental Health Clinics, Richardson - Treatment Centers
- Mental Health Specialists, Richardson - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Richardson
- Messenger Service, Richardson - Message Receiving & Forwarding Service
- Messianic Synagogues, Richardson
- Metal Buildings, Richardson - Kits, Homes, Steel Buildings, etc
- Metal Distributors, Richardson
- Metal Finishing Equipment & Supplies, Richardson
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- Metal Plating & Polishing, Richardson
- Metal Working Machinery, Richardson
- Metallurgical Testing Labs, Richardson
- Metals Base, Richardson
- Meteorologists, Richardson
- Methodist Church, Richardson
- Mexican Food, Richardson
- Mexican Restaurants, Richardson
- Microfilm & Imaging Service, Equipment & Supplies , Richardson
- Microscopes Repair, Richardson
- Middle Eastern Restaurants, Richardson
- Military Supplies, Richardson
- Mind-Body Massage, Richardson
- Minerals, Richardson
- Mini & Self Storage, Richardson
- Mining, Richardson
- Ministries Church, Richardson
- Mirrors, Richardson - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Richardson
- Miscellaneous Agriculture, Richardson
- Miscellaneous Business Services, Richardson
- Miscellaneous Government, Richardson
- Miscellaneous Manufacturing, Richardson
- Miscellaneous Motor Vehicles, Richardson
- Miscellaneous Personal Services, Richardson
- Miscellaneous Photographers, Richardson
- Miscellaneous Professional, Richardson
- Missile & Rocket Manufacturers, Richardson
- Mortgage Bankers & Correspondents, Richardson
- Mortgage Brokers, Richardson
- Mortgages & Loans, Richardson
- Mosques, Richardson
- Motion Picture & Television Production Services, Richardson
- Motion Picture Dists Exchanges & Representatives, Richardson
- Motion Picture Equipment & Supplies, Richardson
- Motion Picture Film, Richardson
- Motion Picture Film Libraries, Richardson
- Motion Picture Pre & Post Production Services, Richardson
- Motion Pictures Video Tape Duplication & Transfer Services, Richardson
- Motivational & Self Improvement Schools, Richardson
- Motivational Speakers & Consultants, Richardson - Speakers, Lectures & Seminars
- Motor Vehicle, Richardson
- Motor Vehicle Rental & Leasing, Richardson
- Motorcycle Parts, Accessories & Dealers, Richardson
- Movie Theaters, Richardson
- Moving & Storage Supplies & Equipment, Richardson
- Moving Companies, Richardson
- Moving Truck Rental , Richardson
- Muffler Shop & Exhaust Systems, Richardson
- Museums, Richardson
- Music, Richardson
- Music Entertainment, Richardson
- Music Lessons, Richardson
- Music Lessons - Instrumental, Richardson
- Music Lessons - Vocal, Richardson
- Music Schools, Richardson
- Musical Instruments & Equipment Stores, Richardson
- Musical Instruments - Guitars, Richardson
- Musical Instruments Repair, Sales & Service, Richardson
- Musical Recording Services, Richardson
- Muslim Church, Richardson
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