- Machine Shop & Tool Repair Service, Northbrook
- Machinery And Equipment Manufacturers, Northbrook
- Machinery Movers & Erectors, Northbrook
- Machinery, Supplies & Equipment - Business Production Related, Northbrook
- Machinery, Supplies & Equipment - Business Supplies Related, Northbrook
- Machinery, Supplies & Equipment - Construction & Contractor Related, Northbrook
- Magazine & Newspaper Stands, Northbrook - Dealers & Distributors
- Mailbox Rental Services, Northbrook
- Mailing, Delivery & Courier Service, Northbrook
- Maintenance, Cleaning & Sanitation, Northbrook
- Major Appliances, Northbrook - Household & Kitchen
- Make Up & Cosmetics Application, Northbrook
- Malls & Shopping Centers, Northbrook
- Management Consultants & Services, Northbrook
- Manicurists & Pedicurists, Northbrook
- Manufacturers Agents & Representatives, Northbrook
- Manufacturers Representative, Northbrook - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Northbrook
- Manufacturing Equipment & Supplies, Northbrook
- Manufacturing Products, Northbrook
- Manufacturing Services, Northbrook
- Marble, Northbrook
- Marble Tile, Northbrook
- Marine Products And Services, Northbrook
- Marine Repair & Service Stations, Northbrook
- Marine Supplies & Equipment, Northbrook - Boat Supplies
- Marine Supplies & Equipment Repair, Northbrook - Boat Supplies & Equipment
- Market Research & Analysis , Northbrook - Market Analysis, Business & Economic Research
- Marketing Schools, Northbrook
- Marriage & Family Counselors, Northbrook
- Marriage & Family Counselors Information & Referrals, Northbrook
- Martial Arts & Self Defense Schools, Northbrook
- Masonry Contractors, Northbrook - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Northbrook
- Massage Therapists & Professional, Northbrook
- Massage Therapy, Northbrook
- Maternity Clothes & Clothing Stores, Northbrook - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Northbrook
- Mechanical Contractors, Northbrook - Install, Service & Repair
- Medical & Dental Management, Northbrook
- Medical & Health Service Organizations, Northbrook
- Medical & Infectious Waste Disposal, Northbrook
- Medical Bill Auditing Services, Northbrook
- Medical Billing Services, Northbrook
- Medical Diagnostic Clinics, Northbrook - Clinical Labs & Centers
- Medical Groups & Clinics, Northbrook - Medical & Health Centers
- Medical Supplies & Equipment, Northbrook
- Mediterranean Restaurants, Northbrook
- Meeting & Event Planning Services, Northbrook - Conference Consultants
- Membership Sports & Recreation Clubs, Northbrook
- Men's Clothing Stores, Northbrook - Clothes & Accessories
- Mental Health Specialists, Northbrook - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Northbrook
- Messenger Service, Northbrook - Message Receiving & Forwarding Service
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- Messianic Synagogues, Northbrook
- Metal Coating & Allied Services, Northbrook
- Metal Cutting Services, Northbrook
- Metal Distributors, Northbrook
- Metal Plating & Polishing, Northbrook
- Metal Repair Service & Blacksmith, Northbrook - Iron Works
- Metal Specialties, Northbrook
- Metal Working Machinery, Northbrook
- Methodist Church, Northbrook
- Mexican Restaurants, Northbrook
- Mildew Removal & Control, Northbrook - Mold Removal
- Mining, Northbrook
- Mining Contractors, Northbrook - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Northbrook - Mining Companies
- Mirrors, Northbrook - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Northbrook
- Miscellaneous Household Item Repair, Northbrook
- Miscellaneous Business Services, Northbrook
- Miscellaneous Government, Northbrook
- Miscellaneous Industry, Northbrook
- Miscellaneous Manufacturing, Northbrook
- Miscellaneous Personal Services, Northbrook
- Miscellaneous Photographers, Northbrook
- Miscellaneous Professional, Northbrook
- Modular & Mobile Homes For Sale, Northbrook - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Northbrook
- Mortgage Companies, Northbrook
- Mortgages & Loans, Northbrook
- Motion Picture & Television Production Services, Northbrook
- Motion Picture Equipment & Supplies, Northbrook
- Motion Picture Pre & Post Production Services, Northbrook
- Motion Pictures Video Tape Duplication & Transfer Services, Northbrook
- Motor Vehicle, Northbrook
- Motor Vehicle Rental & Leasing, Northbrook
- Motorcycle Parts, Accessories & Dealers, Northbrook
- Movie Theaters, Northbrook
- Moving & Storage Supplies & Equipment, Northbrook
- Moving Companies, Northbrook
- Moving Supplies & Equipment Rental, Northbrook
- Moving Truck Rental , Northbrook
- Muffler Shop & Exhaust Systems, Northbrook
- Multimedia Publishers, Northbrook - Multimedia Services & Systems
- Music, Northbrook
- Music Entertainment, Northbrook
- Music Lessons, Northbrook
- Music Lessons - Instrumental, Northbrook
- Music Lessons - Vocal, Northbrook
- Musical Instrument Manufacturers, Northbrook
- Musical Instrument Rental, Northbrook - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Northbrook
- Musical Instruments Repair, Sales & Service, Northbrook
- Musical Recording Services, Northbrook
- Musicians, Bands & Disc Jockeys, Northbrook
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