- Machine Shop & Tool Repair Service, Barrington
- Machinery, Supplies & Equipment - Business Production Related, Barrington
- Mailbox Rental Services, Barrington
- Mailing, Delivery & Courier Service, Barrington
- Major Appliances, Barrington - Household & Kitchen
- Management Consultants & Services, Barrington
- Manicurists & Pedicurists, Barrington
- Manufacturers Agents & Representatives, Barrington
- Manufacturers Representative, Barrington - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Barrington
- Manufacturing Products, Barrington
- Marinas & Marina Services, Barrington
- Marine Products And Services, Barrington
- Marine Services, Barrington
- Marriage & Family Counselors, Barrington
- Masonry Contractors, Barrington - Stone Mason, Brick Mason - Install & Repair
- Mastectomy Apparel, Forms, Prostheses & Supplies, Barrington
- Medical Supplies & Equipment, Barrington
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- Membership Sports & Recreation Clubs, Barrington
- Men's Clothing Stores, Barrington - Clothes & Accessories
- Mental Health Specialists, Barrington - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Barrington
- Mini & Self Storage, Barrington
- Miscellaneous Household Item Repair, Barrington
- Miscellaneous Government, Barrington
- Miscellaneous Manufacturing, Barrington
- Miscellaneous Personal Services, Barrington
- Miscellaneous Professional, Barrington
- Mortgage Bankers & Correspondents, Barrington
- Motor Vehicle, Barrington
- Motor Vehicle Rental & Leasing, Barrington
- Moving & Storage Supplies & Equipment, Barrington
- Moving Truck Rental , Barrington
- Muffler Shop & Exhaust Systems, Barrington
- Music, Barrington
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