- Machine Shop, Houston
- Machine Shop & Tool Repair Service, Houston
- Machine Shop Equipment & Supplies, Houston
- Machine Shop Rotary Surface Grinding, Houston - Tool Grinding & Sharpening
- Machine Shops Slings, Houston
- Machine Tool Repair & Rebuild, Houston
- Machine Tools , Houston
- Machine Tools Manufacturers Metal Cutting Types, Houston
- Machinery And Equipment Manufacturers, Houston
- Machinery Custom Design Manufacturers, Houston
- Machinery Movers & Erectors, Houston
- Machinery Repair & Rebuild, Houston
- Machinery, Supplies & Equipment - Business Production Related, Houston
- Machinery, Supplies & Equipment - Business Supplies Related, Houston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Houston
- Magazine & Newspaper Stands, Houston - Dealers & Distributors
- Magazine Printing & Publishing, Houston
- Magicians & Hypnotist Entertainers, Houston
- Mail Delivery Service, Houston
- Mail Receiving & Forwarding Service, Houston
- Mailbox Rental Services, Houston
- Mailboxes Retail, Houston
- Mailing List Service, Brokers & Compilers, Houston
- Mailing, Delivery & Courier Service, Houston
- Maintenance, Cleaning & Sanitation, Houston
- Major Appliances, Houston - Household & Kitchen
- Make Up & Cosmetics Application, Houston
- Malaysian Restaurants, Houston
- Malls & Shopping Centers, Houston
- Mammography Clinics, Houston - Breast Cancer Screening
- Management Consultants & Services, Houston
- Management Research, Houston
- Management Training & Development, Houston
- Manholes & Manhole Covers Manufacturers, Houston
- Manicurists & Pedicurists, Houston
- Mannequins & Showroom Equipment, Houston
- Manufactured & Mobile Home Movers & Transporting, Houston
- Manufacturers Agents & Representatives, Houston
- Manufacturers Representative, Houston - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Houston
- Manufacturing & Industrial Consultants, Houston
- Manufacturing Equipment & Supplies, Houston
- Manufacturing Products, Houston
- Manufacturing Services, Houston
- Map Publishers & Printers, Houston
- Mapping & Topographical Services, Houston
- Maps & Globes, Houston
- Maps & Supplies, Houston
- Marble, Houston
- Marble & Terrazzo Flooring - Cleaning & Service, Houston
- Marble Contractors, Houston - Installation, Cleaning & Removal Services
- Marble Tile, Houston
- Marinas & Aquariums, Houston
- Marinas & Marina Services, Houston
- Marine Contractors & Designers, Houston
- Marine Documentation & Registries, Houston
- Marine Electronic Equipment, Houston
- Marine Engineers, Houston
- Marine Pilot & Operator Service, Houston
- Marine Products And Services, Houston
- Marine Repair & Service Stations, Houston
- Marine Salvage & Wrecking Services, Houston
- Marine Services, Houston
- Marine Supplies & Equipment, Houston - Boat Supplies
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Houston
- Marine Supplies & Equipment Repair, Houston - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Houston
- Marine Transportation Consultants, Houston
- Market Research & Analysis , Houston - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Houston
- Marketing Schools, Houston
- Markets & Grocers Equipment, Houston
- Marking, Stamping & Engraving Equipment, Houston
- Marriage & Family Counselors, Houston
- Marriage & Family Counselors Information & Referrals, Houston
- Martial Arts & Self Defense Schools, Houston
- Mary Kay Cosmetics, Houston
- Masking & Shipping Tapes, Houston
- Masonry Contractors, Houston - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Houston
- Massage Equipment & Supplies, Houston
- Massage Parlor & Steam Bath Services, Houston
- Massage Therapists & Professional, Houston
- Massage Therapy, Houston
- Mastectomy Apparel, Forms, Prostheses & Supplies, Houston
- Material Handling, Houston
- Material Handling & Heavy Machinery & Equipment, Houston
- Material Handling Consultants, Houston
- Material Handling Equipment, Houston - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Houston - Maternity Dress, Gown, Swimwear, Underwear & More
- Maternity Services, Houston
- Mats & Matting, Houston
- Mats & Matting Rental, Houston
- Mattress & Bedspring Manufacturers, Houston
- Mausoleums Developers, Houston
- Maytag Appliances, Houston
- Mazda Dealers, Houston
- Meals Ready To Eat Manufacturers, Houston
- Measuring Equipment, Houston
- Meat Brokers, Houston
- Meat Market, Wholesale & Products, Houston
- Meat Packers, Houston
- Mechanical Contractors, Houston - Install, Service & Repair
- Mechanical Engineer, Houston - Mechanical Engineering Service
- Mechanical Seals, Houston
- Medical & Dental Assistant Schools, Houston
- Medical & Dental Management, Houston
- Medical & Health Service Organizations, Houston
- Medical & Infectious Waste Disposal, Houston
- Medical Alert Systems, Houston - Medical Alarms - PERS
- Medical Billing Services, Houston
- Medical Billing Software, Houston
- Medical Business Management Services, Houston
- Medical Diagnostic Clinics, Houston - Clinical Labs & Centers
- Medical Diagnostic Imaging, Houston
- Medical Equipment Manufacturers, Houston
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Houston
- Medical Groups & Clinics, Houston - Medical & Health Centers
- Medical Identification Jewelry, Houston
- Medical Management & Business Administration Service, Houston
- Medical Products & Equipment, Houston
- Medical Records Service , Houston
- Medical Research, Houston
- Medical Research & Development, Houston - Medical Information & Research
- Medical Research Facilities, Houston - Research & Development Centers
- Medical Supplies & Equipment, Houston
- Medical Supplies Canes, Houston
- Medical Transcription Service, Houston
- Mediterranean Restaurants, Houston
- Meeting & Event Planning Services, Houston - Conference Consultants
- Membership Sports & Recreation Clubs, Houston
- Memory Improvement Instruction, Houston
- Men's & Boys Clothing & Accessories Stores, Houston
- Men's Clothing Stores, Houston - Clothes & Accessories
- Men's Shoe Stores, Houston
- Mennonite Church, Houston
- Mens & Boys Belts & Suspenders, Houston
- Mens & Boys Hats, Gloves & Neckwear, Houston
- Mens & Boys Jeans & Western Wear Stores, Houston
- Mental Health Clinics, Houston - Treatment Centers
- Mental Health Specialists, Houston - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Houston
- Mercedes Benz Dealers, Houston
- Merchandise Sales Events, Houston
- Merchandising & Marketing Consultants, Houston
- Merchandising & Pricing Equipment, Houston
- Merger & Acquisition Services, Houston
- Merle Norman Cosmetics, Houston
- Messenger Service, Houston - Message Receiving & Forwarding Service
- Messianic Church, Houston
- Metal Buildings, Houston - Kits, Homes, Steel Buildings, etc
- Metal Cleaning & Pickling, Houston
- Metal Coating & Allied Services, Houston
- Metal Cutting Services, Houston
- Metal Detecting Equipment, Houston
- Metal Distributors, Houston
- Metal Etching, Houston
- Metal Finishers, Houston
- Metal Galvanizing, Houston
- Metal Goods Alloys, Houston
- Metal Heat Treating, Houston
- Metal Perforating & Punching, Houston
- Metal Pigment & Paint Products, Houston
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- Metal Plating & Polishing, Houston
- Metal Powder Parts Fabricators, Houston
- Metal Powder Products, Houston
- Metal Products, Houston
- Metal Products, Houston
- Metal Ramps, Houston
- Metal Repair Service & Blacksmith, Houston - Iron Works
- Metal Roll Forming Manufacturers, Houston
- Metal Roofs, Houston
- Metal Services, Houston
- Metal Shackles, Houston
- Metal Specialties, Houston
- Metal Spinning Manufacturers, Houston
- Metal Stampings Manufacturers, Houston
- Metal Supplies, Houston
- Metal Tanks, Houston
- Metal Testing Testing Labs, Houston
- Metal Windows, Houston
- Metal Working Machinery, Houston
- Metallizing Equipment, Houston
- Metallurgical Testing Labs, Houston
- Metals Base, Houston
- Metaphysical Churches, Houston
- Metaphysicians, Houston
- Meters Repair, Houston
- Methodist Church, Houston
- Metropolitan Church, Houston
- Mexican & Latin American Goods & Products Stores, Houston
- Mexican Food, Houston
- Mexican Food & Goods Products, Houston
- Mexican Food Products Manufacturers, Houston
- Mexican Restaurants, Houston
- Microfilm & Imaging Service, Equipment & Supplies , Houston
- Microfilming & Imaging Service, Houston
- Microscopes Repair, Houston
- Microwave Ovens, Houston
- Middle Eastern Restaurants, Houston
- Midwives, Houston
- Mildew Removal & Control, Houston - Mold Removal
- Military Supplies, Houston
- Mill Supplies & Equipment, Houston - Milling Machines
- Millwork Contractors, Houston
- Millwork Contractors, Houston
- Millwork Manufacturers, Houston
- Millwrights, Houston
- Minerals, Houston
- Mini & Self Storage, Houston
- Mining, Houston
- Mining Contractors, Houston - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Houston
- Mining Equipment & Supplies, Houston
- Mining Services, Houston
- Mining, Crude-Oil Production, Houston - Mining Companies
- Ministers, Houston
- Ministries Church, Houston
- Mirrors, Houston - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Houston
- Miscellaneous Business Product Repair, Houston
- Miscellaneous Fabricated Wire Products Manufacturers, Houston
- Miscellaneous Household Item Repair, Houston
- Miscellaneous Prosthesis & Appliances, Houston
- Miscellaneous Retail Stores, Houston
- Miscellaneous Agriculture, Houston
- Miscellaneous Business Services, Houston
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Houston
- Miscellaneous Government, Houston
- Miscellaneous Industry, Houston
- Miscellaneous Jewelry, Houston
- Miscellaneous Manufacturing, Houston
- Miscellaneous Metal Work Manufacturers, Houston
- Miscellaneous Motor Vehicles, Houston
- Miscellaneous Personal Services, Houston
- Miscellaneous Photographers, Houston
- Miscellaneous Professional, Houston
- Missile & Rocket Research & Development, Houston
- Missing Persons Organizations, Houston
- Mission Churches, Houston
- Misting Systems, Houston
- Mitsubishi Dealers, Houston
- Mobile Automobile Services, Houston
- Mobile Home Contractors, Houston
- Mobile Home Improvements & Repairs, Houston
- Mobile Home Insurance, Houston
- Mobile Home Parks & Communities , Houston
- Mobile Homes, Houston
- Mobile Homes for Rent & Lease, Houston
- Mobile Homes Manufactures, Houston
- Model Trains, Houston
- Modeling & Talent Agencies, Houston
- Modular & Mobile Homes For Sale, Houston - Manufactured Homes Sale & Service
- Modular Buildings, Houston - Modular Homes Buildings & Offices
- Moldings Materials, Houston
- Molds, Houston
- Molds Manufacturers, Houston
- Money Change Machines, Houston
- Money Counting & Wrapping, Houston
- Money Transfer Service, Houston
- Mongolian Restaurants, Houston
- Monuments, Tombstones, Markers & Memorials, Houston
- Mopeds & Motor Scooters Rental, Houston
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Houston
- Mortgage Bankers & Correspondents, Houston
- Mortgage Companies, Houston
- Mortgage Contracts & Services, Houston
- Mortgage Service Bureaus, Houston
- Mortgages & Loans, Houston
- Mosques, Houston
- Mosquito Control, Houston
- Motion Picture & Television Production Services, Houston
- Motion Picture Dists & Producers, Houston
- Motion Picture Equipment & Supplies, Houston
- Motion Picture Pre & Post Production Services, Houston
- Motion Pictures Video Tape Duplication & Transfer Services, Houston
- Motivational & Self Improvement Schools, Houston
- Motivational Speakers & Consultants, Houston - Speakers, Lectures & Seminars
- Motor Sports, Houston
- Motor Vehicle, Houston
- Motor Vehicle Rental & Leasing, Houston
- Motorcycle & Motor Scooters Dealers, Repair & Service, Houston
- Motorcycle Driving School, Houston
- Motorcycle Parts, Accessories & Dealers, Houston
- Motorcycle Repair & Service, Houston
- Motorcycle Wreckers, Houston
- Motorcycles Paint & Refinishing, Houston
- Motorcycles Transport, Houston
- Motorized Bicycle & Scooter, Houston
- Mountain & Rock Climbing Equipment, Houston
- Movie Theaters, Houston
- Moving & Storage Supplies & Equipment, Houston
- Moving Companies, Houston
- Moving Services - Labor & Material, Houston
- Moving Supplies & Equipment Rental, Houston
- Moving Truck Rental , Houston
- Mowing Service, Houston
- Muffler Shop & Exhaust Systems, Houston
- Mufflers Industrial, Houston
- Mulch, Peat & Moss Products, Houston
- Multimedia Publishers, Houston - Multimedia Services & Systems
- Museums, Houston
- Music, Houston
- Music Background Leased, Houston
- Music Distribution, Houston
- Music Entertainment, Houston
- Music Lessons, Houston
- Music Lessons - Instrumental, Houston
- Music Lessons - Vocal, Houston
- Music Live & Pre Recorded, Houston
- Music Production Services, Houston
- Music Publishers & Distribution, Houston
- Music Schools, Houston
- Music Sheet, Houston
- Music Stores Retail, Houston
- Musical Instrument Manufacturers, Houston
- Musical Instrument Rental, Houston - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Houston
- Musical Instruments - Guitars, Houston
- Musical Instruments - Violins, Houston
- Musical Instruments Repair, Sales & Service, Houston
- Musical Recording Services, Houston
- Musicians, Bands & Disc Jockeys, Houston
- Muslim Church, Houston
- Mystery Shopping Services, Houston
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