- Machine Shop, League City
- Machine Shop & Tool Repair Service, League City
- Machinery And Equipment Manufacturers, League City
- Machinery Movers & Erectors, League City
- Machinery, Supplies & Equipment - Business Production Related, League City
- Machinery, Supplies & Equipment - Business Supplies Related, League City
- Machinery, Supplies & Equipment - Construction & Contractor Related, League City
- Mailbox Rental Services, League City
- Mailing, Delivery & Courier Service, League City
- Major Appliances, League City - Household & Kitchen
- Make Up & Cosmetics Application, League City
- Mammography Clinics, League City - Breast Cancer Screening
- Management Consultants & Services, League City
- Management Training & Development, League City
- Manicurists & Pedicurists, League City
- Manufacturers Agents & Representatives, League City
- Manufacturers Representative, League City - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, League City
- Manufacturing & Industrial Consultants, League City
- Manufacturing Equipment & Supplies, League City
- Manufacturing Products, League City
- Marinas & Marina Services, League City
- Marine Contractors & Designers, League City
- Marine Products And Services, League City
- Marine Repair & Service Stations, League City
- Marine Services, League City
- Marine Supplies & Equipment Repair, League City - Boat Supplies & Equipment
- Marriage & Family Counselors, League City
- Martial Arts & Self Defense Schools, League City
- Masonry Contractors, League City - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, League City
- Massage Therapists & Professional, League City
- Massage Therapy, League City
- Mastectomy Apparel, Forms, Prostheses & Supplies, League City
- Material Handling & Heavy Machinery & Equipment, League City
- Material Handling Equipment, League City - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, League City
- Mechanical Engineer, League City - Mechanical Engineering Service
- Medical & Dental Associations, League City
- Medical & Health Service Organizations, League City
- Medical Billing Services, League City
- Medical Diagnostic Clinics, League City - Clinical Labs & Centers
- Medical Equipment Manufacturers, League City
- Medical Supplies & Equipment, League City
- Meeting & Event Planning Services, League City - Conference Consultants
- Membership Sports & Recreation Clubs, League City
- Men's Clothing Stores, League City - Clothes & Accessories
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- Mental Health Clinics, League City - Treatment Centers
- Mental Health Specialists, League City - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, League City
- Metal Repair Service & Blacksmith, League City - Iron Works
- Methodist Church, League City
- Mexican Restaurants, League City
- Middle Eastern Restaurants, League City
- Mini & Self Storage, League City
- Mining, League City
- Ministries Church, League City
- Mirrors, League City - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, League City
- Miscellaneous Household Item Repair, League City
- Miscellaneous Business Services, League City
- Miscellaneous Government, League City
- Miscellaneous Industry, League City
- Miscellaneous Manufacturing, League City
- Miscellaneous Personal Services, League City
- Miscellaneous Photographers, League City
- Miscellaneous Professional, League City
- Mobile Automobile Services, League City
- Mobile Home Parks & Communities , League City
- Modular & Mobile Homes For Sale, League City - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, League City
- Mortgage Bankers & Correspondents, League City
- Mortgage Brokers, League City
- Mortgages & Loans, League City
- Motor Vehicle, League City
- Motor Vehicle Rental & Leasing, League City
- Motorcycle & ATV Repair & Service, League City
- Motorcycle & Motor Scooters Dealers, Repair & Service, League City
- Motorcycle Detailing, League City
- Motorcycle Parts, Accessories & Dealers, League City
- Motorcycle Repair & Service, League City
- Moving & Storage Supplies & Equipment, League City
- Moving Companies, League City
- Moving Services - Labor & Material, League City
- Moving Supplies & Equipment Rental, League City
- Moving Truck Rental , League City
- Muffler Shop & Exhaust Systems, League City
- Museums, League City
- Music, League City
- Musical Instrument Manufacturers, League City
- Musical Instrument Rental, League City - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, League City
- Musical Instruments - Guitars, League City
- Musical Instruments Repair, Sales & Service, League City
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