- Machine Shop, Willowbrook
- Machine Shop & Tool Repair Service, Willowbrook
- Machinery, Supplies & Equipment - Business Production Related, Willowbrook
- Machinery, Supplies & Equipment - Business Supplies Related, Willowbrook
- Machinery, Supplies & Equipment - Construction & Contractor Related, Willowbrook
- Mailing, Delivery & Courier Service, Willowbrook
- Maintenance, Cleaning & Sanitation, Willowbrook
- Management Consultants & Services, Willowbrook
- Manicurists & Pedicurists, Willowbrook
- Manufacturers Agents & Representatives, Willowbrook
- Manufacturers Representative, Willowbrook - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Willowbrook
- Market Research & Analysis , Willowbrook - Market Analysis, Business & Economic Research
- Martial Arts & Self Defense Schools, Willowbrook
- Masonry Materials & Supplies, Willowbrook
- Massage Therapists & Professional, Willowbrook
- Massage Therapy, Willowbrook
- Material Handling Equipment, Willowbrook - Conveyor Belt, Pallet Jack, Forklift, etc
- Mechanical Contractors, Willowbrook - Install, Service & Repair
- Medical & Dental Management, Willowbrook
- Medical & Health Service Organizations, Willowbrook
- Medical Diagnostic Clinics, Willowbrook - Clinical Labs & Centers
- Medical Supplies & Equipment, Willowbrook
- Meeting & Event Planning Services, Willowbrook - Conference Consultants
- Men's Clothing Stores, Willowbrook - Clothes & Accessories
- Mental Health Specialists, Willowbrook - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Willowbrook - Message Receiving & Forwarding Service
- Metal Coating & Allied Services, Willowbrook
- Metal Forming Equipment, Willowbrook
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- Metal Forming Machinery, Willowbrook
- Metal Goods Alloys, Willowbrook
- Metal Repair Service & Blacksmith, Willowbrook - Iron Works
- Metal Working Machinery, Willowbrook
- Mexican Restaurants, Willowbrook
- Middle Eastern Restaurants, Willowbrook
- Mildew Removal & Control, Willowbrook - Mold Removal
- Mini & Self Storage, Willowbrook
- Mining Equipment & Supplies, Willowbrook
- Miscellaneous Business Product Repair, Willowbrook
- Miscellaneous Household Item Repair, Willowbrook
- Miscellaneous Agriculture, Willowbrook
- Miscellaneous Business Services, Willowbrook
- Miscellaneous Government, Willowbrook
- Miscellaneous Industry, Willowbrook
- Miscellaneous Manufacturing, Willowbrook
- Miscellaneous Personal Services, Willowbrook
- Miscellaneous Professional, Willowbrook
- Mission Churches, Willowbrook
- Modular & Mobile Homes For Sale, Willowbrook - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Willowbrook
- Motor Vehicle, Willowbrook
- Motor Vehicle Rental & Leasing, Willowbrook
- Motorcycle Parts, Accessories & Dealers, Willowbrook
- Mulch, Peat & Moss Products, Willowbrook
- Music, Willowbrook
- Musical Instrument Rental, Willowbrook - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Willowbrook
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