- Machine Shop, Chicago
- Machine Shop & Tool Repair Service, Chicago
- Machine Shop Rotary Surface Grinding, Chicago - Tool Grinding & Sharpening
- Machine Shops Slings, Chicago
- Machine Tool Repair & Rebuild, Chicago
- Machine Tools , Chicago
- Machine Tools Manufacturers Metal Forming Types, Chicago
- Machinery And Equipment Manufacturers, Chicago
- Machinery Balancing Equipment, Chicago
- Machinery Movers & Erectors, Chicago
- Machinery Repair & Rebuild, Chicago
- Machinery, Supplies & Equipment - Business Production Related, Chicago
- Machinery, Supplies & Equipment - Business Supplies Related, Chicago
- Machinery, Supplies & Equipment - Construction & Contractor Related, Chicago
- Macrame & Macrame Supplies, Chicago
- Magazine & Newspaper Stands, Chicago - Dealers & Distributors
- Magazine Printing & Publishing, Chicago
- Magicians & Hypnotist Entertainers, Chicago
- Magicians & Jugglers Equipment & Supplies, Chicago
- Magnetic & Optical Recording Media Manufacturers, Chicago
- Magnetos, Chicago
- Mail Delivery Service, Chicago
- Mailbox Rental Services, Chicago
- Mailboxes Retail, Chicago
- Mailing List Service, Brokers & Compilers, Chicago
- Mailing, Delivery & Courier Service, Chicago
- Maintenance, Cleaning & Sanitation, Chicago
- Major Appliance Repair & Service, Chicago
- Major Appliances, Chicago - Household & Kitchen
- Make Up & Cosmetics Application, Chicago
- Make Up Masquerade & Theatrical, Chicago
- Malls & Shopping Centers, Chicago
- Malpractice Attorneys & Lawyers, Chicago
- Malpractice Attorneys & Lawyers, Chicago
- Malpractice Lawyers & Attorneys, Chicago
- Mammography Clinics, Chicago - Breast Cancer Screening
- Management Consultants & Services, Chicago
- Management Training & Development, Chicago
- Mandarin Restaurants, Chicago
- Manicurists & Pedicurists, Chicago
- Manifold Business Forms Manufacturers, Chicago
- Manufacturers Agents & Representatives, Chicago
- Manufacturers Representative, Chicago - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Chicago
- Manufacturing & Industrial Consultants, Chicago
- Manufacturing Equipment & Supplies, Chicago
- Manufacturing Products, Chicago
- Manufacturing Services, Chicago
- Maps & Globes, Chicago
- Marble, Chicago
- Marble Contractors, Chicago - Installation, Cleaning & Removal Services
- Marble Contractors Equipment & Supplies, Chicago
- Marinas & Aquariums, Chicago
- Marinas & Marina Services, Chicago
- Marine Contractors & Designers, Chicago
- Marine Electronic Equipment, Chicago
- Marine Products And Services, Chicago
- Marine Repair & Service Stations, Chicago
- Marine Services, Chicago
- Marine Supplies & Equipment, Chicago - Boat Supplies
- Marine Supplies & Equipment Repair, Chicago - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Chicago
- Marionettes & Puppets, Chicago
- Market Research & Analysis , Chicago - Market Analysis, Business & Economic Research
- Marketing, Chicago
- Marketing Consultants Professional Practices, Chicago
- Marketing Schools, Chicago
- Markets & Grocers Equipment, Chicago
- Marriage & Family Counselors, Chicago
- Marriage & Family Counselors Information & Referrals, Chicago
- Martial Arts & Self Defense Schools, Chicago
- Mary Kay Cosmetics, Chicago
- Masonry Contractors, Chicago - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Chicago
- Massage Equipment & Supplies, Chicago
- Massage Parlor & Steam Bath Services, Chicago
- Massage Therapists & Professional, Chicago
- Massage Therapy, Chicago
- Massage Therapy Relaxation, Chicago
- Mastectomy Apparel, Forms, Prostheses & Supplies, Chicago
- Material Chutes, Chicago
- Material Handling & Heavy Machinery & Equipment, Chicago
- Material Handling Equipment, Chicago - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Chicago - Maternity Dress, Gown, Swimwear, Underwear & More
- Mathematicians, Chicago
- Mats & Matting, Chicago
- Mats & Matting Manufacturers, Chicago
- Mats & Matting Rental, Chicago
- Mausoleum Builders, Chicago
- Maytag Appliances, Chicago
- Measuring Instruments, Chicago - Measuring Machines & Equipment
- Meat Brokers, Chicago
- Meat Market, Wholesale & Products, Chicago
- Meat Packers, Chicago
- Mechanical Contractors, Chicago - Install, Service & Repair
- Mechanical Floats, Chicago
- Media Research, Chicago
- Medical & Dental Assistant Schools, Chicago
- Medical & Dental Associations, Chicago
- Medical & Dental Management, Chicago
- Medical & Health Service Organizations, Chicago
- Medical & Infectious Waste Disposal, Chicago
- Medical Attorneys & Lawyers, Chicago
- Medical Attorneys & Lawyers, Chicago
- Medical Bill Auditing Services, Chicago
- Medical Billing Services, Chicago
- Medical Billing Software, Chicago
- Medical Diagnostic Clinics, Chicago - Clinical Labs & Centers
- Medical Equipment Manufacturers, Chicago
- Medical Groups & Clinics, Chicago - Medical & Health Centers
- Medical Lawyers & Attorneys, Chicago
- Medical Management & Business Administration Service, Chicago
- Medical Research, Chicago
- Medical Research & Development, Chicago - Medical Information & Research
- Medical Supplies & Equipment, Chicago
- Medical Supplies Canes, Chicago
- Medical Transcription Service, Chicago
- Mediterranean Restaurants, Chicago
- Meeting & Event Planning Services, Chicago - Conference Consultants
- Membership Organizations, Chicago
- Membership Sports & Recreation Clubs, Chicago
- Men's & Boys Clothing & Accessories Stores, Chicago
- Men's Clothing Stores, Chicago - Clothes & Accessories
- Men's Shoe Stores, Chicago
- Mennonite Church, Chicago
- Mens & Boys Belts & Suspenders, Chicago
- Mens & Boys Hats, Gloves & Neckwear, Chicago
- Mens & Boys Jeans & Western Wear Stores, Chicago
- Mens & Womens Clothing, Chicago
- Mental & Developmental Information & Referral Services, Chicago
- Mental Health Clinics, Chicago - Treatment Centers
- Mental Health Specialists, Chicago - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Chicago
- Merchandising & Marketing Consultants, Chicago
- Merchandising & Pricing Equipment, Chicago
- Messenger Service, Chicago - Message Receiving & Forwarding Service
- Messianic Synagogues, Chicago
- Metal Bending & Straightening, Chicago
- Metal Boxes, Chicago
- Metal Boxes & Containers, Chicago
- Metal Buildings, Chicago - Kits, Homes, Steel Buildings, etc
- Metal Buyers, Chicago
- Metal Cans Manufacturers, Chicago
- Metal Cleaning & Pickling, Chicago
- Metal Coating & Allied Services, Chicago
- Metal Cutting Machines, Chicago
- Metal Cutting Services, Chicago
- Metal Detecting Equipment, Chicago
- Metal Distributors, Chicago
- Metal Extrusions Impact, Chicago
- Metal Finishers, Chicago
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- Metal Finishing Equipment & Supplies, Chicago
- Metal Foil & Leaf Manufacturers, Chicago
- Metal Folding Furniture Manufacturers, Chicago
- Metal Forming Equipment, Chicago
- Metal Forming Machinery, Chicago
- Metal Galvanizing, Chicago
- Metal Goods Alloys, Chicago
- Metal Heat Treating, Chicago
- Metal Lockers, Chicago
- Metal Pails, Drums & Barrel Manufacturers, Chicago
- Metal Perforating & Punching, Chicago
- Metal Plating & Polishing, Chicago
- Metal Polishing & Buffing, Chicago
- Metal Products, Chicago
- Metal Products, Chicago
- Metal Repair Service & Blacksmith, Chicago - Iron Works
- Metal Roll Forming Manufacturers, Chicago
- Metal Services, Chicago
- Metal Specialties, Chicago
- Metal Spinning Manufacturers, Chicago
- Metal Stamping Equipment, Chicago
- Metal Stampings Manufacturers, Chicago
- Metal Tablets, Chicago
- Metal Tanks, Chicago
- Metal Working Machinery, Chicago
- Metals Base, Chicago
- Metaphysical Churches, Chicago
- Metaphysicians, Chicago
- Methodist Church, Chicago
- Metropolitan Church, Chicago
- Mexican & Latin American Goods & Products Stores, Chicago
- Mexican Food & Goods Products, Chicago
- Mexican Restaurants, Chicago
- Microfilm & Imaging Service, Equipment & Supplies , Chicago
- Middle Eastern Restaurants, Chicago
- Midwives, Chicago
- Mildew Removal & Control, Chicago - Mold Removal
- Military Supplies, Chicago
- Millwork Contractors, Chicago
- Millwrights, Chicago
- Minerals, Chicago
- Mini & Self Storage, Chicago
- Mini Golf Courses, Chicago
- Mining, Chicago
- Mining Contractors, Chicago - Mining Companies, Contractors & Brokers
- Mining Services, Chicago
- Mining, Crude-Oil Production, Chicago - Mining Companies
- Ministries Church, Chicago
- Mirrors, Chicago - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Chicago
- Miscellaneous Household Item Repair, Chicago
- Miscellaneous Prosthesis & Appliances, Chicago
- Miscellaneous Retail Stores, Chicago
- Miscellaneous Agriculture, Chicago
- Miscellaneous Business Services, Chicago
- Miscellaneous Government, Chicago
- Miscellaneous Industry, Chicago
- Miscellaneous Manufacturing, Chicago
- Miscellaneous Metal Work Manufacturers, Chicago
- Miscellaneous Personal Services, Chicago
- Miscellaneous Photographers, Chicago
- Miscellaneous Professional, Chicago
- Miscellaneous Toys & Supplies, Chicago
- Missile & Rocket Instrumentation & Guidance Equipment, Chicago
- Missiles & Rockets, Chicago
- Mission Churches, Chicago
- Mobile Home Contractors, Chicago
- Mobile Home Improvements & Repairs, Chicago
- Mobile Home Parks & Communities , Chicago
- Mobile Homes for Rent & Lease, Chicago
- Mobile Lube Systems, Chicago
- Model Car Racing Centers, Chicago
- Modeling & Talent Agencies, Chicago
- Modular & Mobile Homes For Sale, Chicago - Manufactured Homes Sale & Service
- Moldings Materials, Chicago
- Molds, Chicago
- Money Change Machines, Chicago
- Money Counting & Wrapping, Chicago
- Money Transfer Service, Chicago
- Monuments, Tombstones, Markers & Memorials, Chicago
- Mopeds & Motor Scooters Rental, Chicago
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Chicago
- Mops & Brooms Manufacturers, Chicago
- Mops Wholesale & Retail, Chicago
- Mortgage Bankers & Correspondents, Chicago
- Mortgage Brokers, Chicago
- Mortgage Companies, Chicago
- Mortgage Feasibility Consultants, Chicago
- Mortgage Loan Processors, Chicago
- Mortgage Service Bureaus, Chicago
- Mortgages & Loans, Chicago
- Mosquito Control, Chicago
- Motion Picture & Television Production Services, Chicago
- Motion Picture Consultants, Chicago
- Motion Picture Dists & Producers, Chicago
- Motion Picture Dists Exchanges & Representatives, Chicago
- Motion Picture Equipment & Supplies, Chicago
- Motion Picture Film Festivals, Chicago
- Motion Picture Film Libraries, Chicago
- Motion Picture Film Storage, Chicago
- Motion Picture Pre & Post Production Services, Chicago
- Motion Picture Projection Service, Chicago
- Motion Pictures Video Tape Duplication & Transfer Services, Chicago
- Motivational & Self Improvement Schools, Chicago
- Motor Homes, Chicago
- Motor Vehicle, Chicago
- Motor Vehicle Rental & Leasing, Chicago
- Motorcycle & Motor Scooters Dealers, Repair & Service, Chicago
- Motorcycle Detailing, Chicago
- Motorcycle Driving School, Chicago
- Motorcycle Parts, Accessories & Dealers, Chicago
- Motorcycle Repair & Service, Chicago
- Motorized Bicycle & Scooter, Chicago
- Movie Advertising, Chicago
- Movie Theaters, Chicago
- Moving & Storage Consultants, Chicago
- Moving & Storage Supplies & Equipment, Chicago
- Moving Companies, Chicago
- Moving Equipment & Supplies Wholesale, Chicago
- Moving Services - Labor & Material, Chicago
- Moving Supplies & Equipment Rental, Chicago
- Moving Truck Rental , Chicago
- Muffler Shop & Exhaust Systems, Chicago
- Mulch, Peat & Moss Products, Chicago
- Multimedia Publishers, Chicago - Multimedia Services & Systems
- Murals & Faux Finish Walls, Chicago
- Museums, Chicago
- Music, Chicago
- Music Background Leased, Chicago
- Music Binding Services, Chicago
- Music Distribution, Chicago
- Music Entertainment, Chicago
- Music Lessons, Chicago
- Music Lessons - Instrumental, Chicago
- Music Lessons - Vocal, Chicago
- Music Production Services, Chicago
- Music Publishers & Distribution, Chicago
- Music Rental & Leasing, Chicago
- Music Schools, Chicago
- Music Sheet, Chicago
- Music Stores Retail, Chicago
- Musical Instrument Manufacturers, Chicago
- Musical Instrument Rental, Chicago - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Chicago
- Musical Instruments - Guitars, Chicago
- Musical Instruments Amplifier Repairing, Chicago
- Musical Instruments Repair, Sales & Service, Chicago
- Musical Instruments Supplies & Accessories Manufacturers, Chicago
- Musical Recording Services, Chicago
- Musicians, Bands & Disc Jockeys, Chicago
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