- Machine Shop & Tool Repair Service, East Haven
- Machinery, Supplies & Equipment - Business Supplies Related, East Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Haven
- Major Appliances, East Haven - Household & Kitchen
- Management Consultants & Services, East Haven
- Manicurists & Pedicurists, East Haven
- Manufacturing, East Haven
- Marble & Terrazzo Flooring - Cleaning & Service, East Haven
- Marine Products And Services, East Haven
- Marine Services, East Haven
- Marketing Research & Design, East Haven
- Martial Arts & Self Defense Schools, East Haven
- Masonry Contractors, East Haven - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, East Haven
- Medical Billing Services, East Haven
- Medical Supplies & Equipment, East Haven
- Mediterranean Restaurants, East Haven
- Membership Sports & Recreation Clubs, East Haven
- Men's Clothing Stores, East Haven - Clothes & Accessories
- Mental Health Specialists, East Haven - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, East Haven
- Mini & Self Storage, East Haven
- Miscellaneous Household Item Repair, East Haven
- Miscellaneous Business Services, East Haven
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- Miscellaneous Government, East Haven
- Miscellaneous Photographers, East Haven
- Miscellaneous Professional, East Haven
- Mission Churches, East Haven
- Money Transfer Service, East Haven
- Mormon Churches, East Haven
- Mortgage Bankers & Correspondents, East Haven
- Mortgages & Loans, East Haven
- Motion Picture & Television Production Services, East Haven
- Motion Picture Dists & Producers, East Haven
- Motion Picture Pre & Post Production Services, East Haven
- Motor Vehicle, East Haven
- Motor Vehicle Rental & Leasing, East Haven
- Motorcycle Parts, Accessories & Dealers, East Haven
- Motorcycle Repair & Service, East Haven
- Motorcycles Paint & Refinishing, East Haven
- Moving & Storage Supplies & Equipment, East Haven
- Moving Companies, East Haven
- Moving Supplies & Equipment Rental, East Haven
- Moving Truck Rental , East Haven
- Muffler Shop & Exhaust Systems, East Haven
- Museums, East Haven
- Music, East Haven
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