- Machine Parts Metal Manufacturers, Willis
- Machine Shop & Tool Repair Service, Willis
- Machine Tool Repair & Rebuild, Willis
- Machinery And Equipment Manufacturers, Willis
- Machinery, Supplies & Equipment - Business Production Related, Willis
- Machinery, Supplies & Equipment - Business Supplies Related, Willis
- Machinery, Supplies & Equipment - Construction & Contractor Related, Willis
- Mailbox Rental Services, Willis
- Mailing, Delivery & Courier Service, Willis
- Management Consultants & Services, Willis
- Manicurists & Pedicurists, Willis
- Manufacturers Agents & Representatives, Willis
- Manufacturers Representative, Willis - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Willis
- Manufacturing & Industrial Consultants, Willis
- Manufacturing Products, Willis
- Marinas & Marina Services, Willis
- Martial Arts & Self Defense Schools, Willis
- Masonry Materials & Supplies, Willis
- Meat Market, Wholesale & Products, Willis
- Mechanical Contractors, Willis - Install, Service & Repair
- Mechanical Engineer, Willis - Mechanical Engineering Service
- Medical & Health Service Organizations, Willis
- Medical Equipment Manufacturers, Willis
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Willis
- Medical Products & Equipment, Willis
- Medical Supplies & Equipment, Willis
- Membership Sports & Recreation Clubs, Willis
- Mental Retardation & Developmentally Disabled Services, Willis
- Metal Buildings, Willis - Wood Buildings
- Metal Buildings, Willis - Kits, Homes, Steel Buildings, etc
- Metal Products, Willis
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- Metal Repair Service & Blacksmith, Willis - Iron Works
- Methodist Church, Willis
- Mexican Restaurants, Willis
- Millwork Contractors, Willis
- Mini & Self Storage, Willis
- Mining, Willis
- Miscellaneous Business Product Repair, Willis
- Miscellaneous Agriculture, Willis
- Miscellaneous Government, Willis
- Miscellaneous Industry, Willis
- Miscellaneous Manufacturing, Willis
- Miscellaneous Personal Services, Willis
- Miscellaneous Professional, Willis
- Modular & Mobile Homes For Sale, Willis - Manufactured Homes Sale & Service
- Money Transfer Service, Willis
- Mongolian Restaurants, Willis
- Mortgage Bankers & Correspondents, Willis
- Mortgages & Loans, Willis
- Motion Pictures Video Tape Duplication & Transfer Services, Willis
- Motor Vehicle, Willis
- Motor Vehicle Rental & Leasing, Willis
- Motorcycle Parts, Accessories & Dealers, Willis
- Moving & Storage Supplies & Equipment, Willis
- Moving Companies, Willis
- Moving Supplies & Equipment Rental, Willis
- Moving Truck Rental , Willis
- Museums, Willis
- Music, Willis
- Musical Instrument Rental, Willis - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Willis
- Musical Recording Services, Willis
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