- Machine Shop & Tool Repair Service, Barrington
- Machinery, Supplies & Equipment - Business Production Related, Barrington
- Machinery, Supplies & Equipment - Business Supplies Related, Barrington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Barrington
- Major Appliances, Barrington - Household & Kitchen
- Management Consultants & Services, Barrington
- Manufacturing, Barrington
- Manufacturing Products, Barrington
- Marine Contractors & Designers, Barrington
- Marriage & Family Counselors, Barrington
- Martial Arts & Self Defense Schools, Barrington
- Masonry Contractors, Barrington - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Barrington
- Massage Therapists & Professional, Barrington
- Massage Therapy, Barrington
- Mechanical Engineer, Barrington - Mechanical Engineering Service
- Medical Supplies & Equipment, Barrington
- Membership Sports & Recreation Clubs, Barrington
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- Metal Repair Service & Blacksmith, Barrington - Iron Works
- Miscellaneous Household Item Repair, Barrington
- Miscellaneous Agriculture, Barrington
- Miscellaneous Personal Services, Barrington
- Miscellaneous Photographers, Barrington
- Miscellaneous Professional, Barrington
- Molds, Barrington
- Mortgage Bankers & Correspondents, Barrington
- Motion Picture Pre & Post Production Services, Barrington
- Motor Vehicle, Barrington
- Motor Vehicle Rental & Leasing, Barrington
- Motorcycle & Motor Scooters Dealers, Repair & Service, Barrington
- Motorcycle Repair & Service, Barrington
- Movie Theaters, Barrington
- Moving Companies, Barrington
- Moving Truck Rental , Barrington
- Music, Barrington
- Musical Instruments & Equipment Stores, Barrington
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