- Machine Shop & Tool Repair Service, West Chicago
- Machine Tools , West Chicago
- Machinery And Equipment Manufacturers, West Chicago
- Machinery Repair & Rebuild, West Chicago
- Machinery, Supplies & Equipment - Business Production Related, West Chicago
- Machinery, Supplies & Equipment - Business Supplies Related, West Chicago
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Chicago
- Mailbox Rental Services, West Chicago
- Mailing, Delivery & Courier Service, West Chicago
- Major Appliances, West Chicago - Household & Kitchen
- Management Consultants & Services, West Chicago
- Manicurists & Pedicurists, West Chicago
- Manufacturers Agents & Representatives, West Chicago
- Manufacturers Representative, West Chicago - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, West Chicago
- Manufacturing Equipment & Supplies, West Chicago
- Manufacturing Products, West Chicago
- Marriage & Family Counselors, West Chicago
- Masonry Contractors, West Chicago - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, West Chicago
- Massage Therapists & Professional, West Chicago
- Massage Therapy, West Chicago
- Material Handling Equipment, West Chicago - Conveyor Belt, Pallet Jack, Forklift, etc
- Maytag Appliances, West Chicago
- Meat Packers, West Chicago
- Mechanical Contractors, West Chicago - Install, Service & Repair
- Medical & Infectious Waste Disposal, West Chicago
- Medical Diagnostic Clinics, West Chicago - Clinical Labs & Centers
- Medical Groups & Clinics, West Chicago - Medical & Health Centers
- Medical Supplies & Equipment, West Chicago
- Membership Sports & Recreation Clubs, West Chicago
- Mental & Developmental Information & Referral Services, West Chicago
- Messenger Service, West Chicago - Message Receiving & Forwarding Service
- Metal Repair Service & Blacksmith, West Chicago - Iron Works
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- Metal Stampings Manufacturers, West Chicago
- Methodist Church, West Chicago
- Mexican Restaurants, West Chicago
- Mini & Self Storage, West Chicago
- Mini Golf Courses, West Chicago
- Mining, West Chicago
- Ministries Church, West Chicago
- Miscellaneous Business Product Repair, West Chicago
- Miscellaneous Household Item Repair, West Chicago
- Miscellaneous Agriculture, West Chicago
- Miscellaneous Government, West Chicago
- Miscellaneous Manufacturing, West Chicago
- Miscellaneous Metal Work Manufacturers, West Chicago
- Miscellaneous Personal Services, West Chicago
- Miscellaneous Photographers, West Chicago
- Miscellaneous Professional, West Chicago
- Modular & Mobile Homes For Sale, West Chicago - Manufactured Homes Sale & Service
- Molds, West Chicago
- Money Transfer Service, West Chicago
- Monuments, Tombstones, Markers & Memorials, West Chicago
- Mortgage Bankers & Correspondents, West Chicago
- Mortgages & Loans, West Chicago
- Motor Vehicle, West Chicago
- Motor Vehicle Rental & Leasing, West Chicago
- Motorcycle Parts, Accessories & Dealers, West Chicago
- Moving & Storage Supplies & Equipment, West Chicago
- Moving Companies, West Chicago
- Moving Supplies & Equipment Rental, West Chicago
- Moving Truck Rental , West Chicago
- Muffler Shop & Exhaust Systems, West Chicago
- Mulch, Peat & Moss Products, West Chicago
- Murals & Faux Finish Walls, West Chicago
- Museums, West Chicago
- Music, West Chicago
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