- Machine Shop & Tool Repair Service, Westbrook
- Machinery, Supplies & Equipment - Business Supplies Related, Westbrook
- Malls & Shopping Centers, Westbrook
- Mammography Clinics, Westbrook - Breast Cancer Screening
- Management Consultants & Services, Westbrook
- Manufacturing, Westbrook
- Marble & Terrazzo Flooring - Cleaning & Service, Westbrook
- Marinas & Marina Services, Westbrook
- Marine Electronic Equipment, Westbrook
- Marine Products And Services, Westbrook
- Marine Services, Westbrook
- Marine Supplies & Equipment, Westbrook - Boat Supplies
- Marriage & Family Counselors, Westbrook
- Masonry Contractors, Westbrook - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Westbrook
- Meat Market, Wholesale & Products, Westbrook
- Mechanical Contractors, Westbrook - Install, Service & Repair
- Medical Supplies & Equipment, Westbrook
- Mediterranean Restaurants, Westbrook
- Men's Clothing Stores, Westbrook - Clothes & Accessories
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- Mens & Womens Clothing, Westbrook
- Metal Repair Service & Blacksmith, Westbrook - Iron Works
- Mexican Restaurants, Westbrook
- Miscellaneous Government, Westbrook
- Miscellaneous Personal Services, Westbrook
- Miscellaneous Professional, Westbrook
- Motion Picture Pre & Post Production Services, Westbrook
- Motion Pictures Video Tape Duplication & Transfer Services, Westbrook
- Motor Vehicle, Westbrook
- Motor Vehicle Rental & Leasing, Westbrook
- Movie Theaters, Westbrook
- Moving Companies, Westbrook
- Moving Supplies & Equipment Rental, Westbrook
- Moving Truck Rental , Westbrook
- Muffler Shop & Exhaust Systems, Westbrook
- Museums, Westbrook
- Music, Westbrook
- Musical Instrument Rental, Westbrook - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Westbrook
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