- Machinery, Supplies & Equipment - Construction & Contractor Related, South Barrington
- Major Appliances, South Barrington - Household & Kitchen
- Malls & Shopping Centers, South Barrington
- Management Consultants & Services, South Barrington
- Manicurists & Pedicurists, South Barrington
- Manufacturing, South Barrington
- Mary Kay Cosmetics, South Barrington
- Maytag Appliances, South Barrington
- Meat Market, Wholesale & Products, South Barrington
- Meat Packers, South Barrington
- Medical & Dental Management, South Barrington
- Medical & Health Service Organizations, South Barrington
- Medical Supplies & Equipment, South Barrington
- Men's Clothing Stores, South Barrington - Clothes & Accessories
- Mental Health Specialists, South Barrington - Psychologist, Psychiatrist, Psychotherapist, etc
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- Mexican Restaurants, South Barrington
- Miscellaneous Personal Services, South Barrington
- Miscellaneous Photographers, South Barrington
- Miscellaneous Professional, South Barrington
- Modular & Mobile Homes For Sale, South Barrington - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, South Barrington
- Mortgages & Loans, South Barrington
- Motor Vehicle, South Barrington
- Motor Vehicle Rental & Leasing, South Barrington
- Movie Theaters, South Barrington
- Moving & Storage Consultants, South Barrington
- Moving Truck Rental , South Barrington
- Museums, South Barrington
- Museums Arboretums, South Barrington
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