- Machine Shop & Tool Repair Service, Ansonia
- Machinery And Equipment Manufacturers, Ansonia
- Malls & Shopping Centers, Ansonia
- Manicurists & Pedicurists, Ansonia
- Manufacturing, Ansonia
- Manufacturing Products, Ansonia
- Marble, Ansonia
- Marine Contractors & Designers, Ansonia
- Marriage & Family Counselors, Ansonia
- Masonry Contractors, Ansonia - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Ansonia
- Medical Billing Services, Ansonia
- Medical Supplies & Equipment, Ansonia
- Men's Clothing Stores, Ansonia - Clothes & Accessories
- Metal Products, Ansonia
- Metal Products, Ansonia
- Methodist Church, Ansonia
- Mexican Restaurants, Ansonia
- Miscellaneous Business Product Repair, Ansonia
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- Miscellaneous Household Item Repair, Ansonia
- Miscellaneous Government, Ansonia
- Miscellaneous Industry, Ansonia
- Miscellaneous Personal Services, Ansonia
- Miscellaneous Professional, Ansonia
- Mortgages & Loans, Ansonia
- Motor Vehicle, Ansonia
- Motor Vehicle Rental & Leasing, Ansonia
- Motorcycle & Motor Scooters Dealers, Repair & Service, Ansonia
- Motorcycle Parts, Accessories & Dealers, Ansonia
- Motorcycle Repair & Service, Ansonia
- Moving Truck Rental , Ansonia
- Muffler Shop & Exhaust Systems, Ansonia
- Music, Ansonia
- Music Lessons, Ansonia
- Music Lessons - Instrumental, Ansonia
- Musical Instrument Rental, Ansonia - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Ansonia
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