- Machine Shop, New Haven
- Machine Shop & Tool Repair Service, New Haven
- Machine Tool Repair & Rebuild, New Haven
- Machinery And Equipment Manufacturers, New Haven
- Machinery, Supplies & Equipment - Business Production Related, New Haven
- Machinery, Supplies & Equipment - Business Supplies Related, New Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Haven
- Magazine & Newspaper Stands, New Haven - Dealers & Distributors
- Mailbox Rental Services, New Haven
- Mailing, Delivery & Courier Service, New Haven
- Maintenance, Cleaning & Sanitation, New Haven
- Major Appliance Repair & Service, New Haven
- Major Appliances, New Haven - Household & Kitchen
- Malls & Shopping Centers, New Haven
- Malpractice Attorneys & Lawyers, New Haven
- Malpractice Attorneys & Lawyers, New Haven
- Malpractice Lawyers & Attorneys, New Haven
- Mammography Clinics, New Haven - Breast Cancer Screening
- Management Consultants & Services, New Haven
- Manicurists & Pedicurists, New Haven
- Manufacturers Agents & Representatives, New Haven
- Manufacturers Representative, New Haven - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, New Haven
- Manufacturing Equipment & Supplies, New Haven
- Manufacturing Products, New Haven
- Marble, New Haven
- Marble & Terrazzo Flooring - Cleaning & Service, New Haven
- Marinas & Marina Services, New Haven
- Marine Electronic Equipment, New Haven
- Marine Supplies & Equipment, New Haven - Boat Supplies
- Marriage & Family Counselors, New Haven
- Martial Arts & Self Defense Schools, New Haven
- Masonry Contractors, New Haven - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, New Haven
- Massage Therapy, New Haven
- Material Handling Equipment, New Haven - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, New Haven
- Meat Market, Wholesale & Products, New Haven
- Mechanical Contractors, New Haven - Install, Service & Repair
- Medical & Dental Associations, New Haven
- Medical & Dental Management, New Haven
- Medical & Health Service Organizations, New Haven
- Medical Business Management Services, New Haven
- Medical Claims Processing & Assistance, New Haven
- Medical Groups & Clinics, New Haven - Medical & Health Centers
- Medical Management & Business Administration Service, New Haven
- Medical Research, New Haven
- Medical Research & Development, New Haven - Medical Information & Research
- Medical Supplies & Equipment, New Haven
- Medical Uniform Accessories, New Haven
- Mediterranean Restaurants, New Haven
- Membership Sports & Recreation Clubs, New Haven
- Men's & Boys Clothing & Accessories Stores, New Haven
- Men's Clothing Stores, New Haven - Clothes & Accessories
- Mens & Boys Belts & Suspenders, New Haven
- Mental Health Clinics, New Haven - Treatment Centers
- Mental Health Specialists, New Haven - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, New Haven
- Merchandising & Marketing Consultants, New Haven
- Metal Coating & Allied Services, New Haven
- Metal Detecting Equipment, New Haven
- Metal Finishers, New Haven
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- Metal Plating & Polishing, New Haven
- Metal Stampings Manufacturers, New Haven
- Metalworking Machinery Manufacturers, New Haven
- Metaphysical Churches, New Haven
- Methodist Church, New Haven
- Mexican & Latin American Goods & Products Stores, New Haven
- Mexican Food, New Haven
- Mexican Restaurants, New Haven
- Microfilm & Imaging Service, Equipment & Supplies , New Haven
- Middle Eastern Restaurants, New Haven
- Midwives, New Haven
- Mildew Removal & Control, New Haven - Mold Removal
- Millwork Contractors, New Haven
- Mini & Self Storage, New Haven
- Ministries Church, New Haven
- Mint Facilities, New Haven
- Mirrors, New Haven - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, New Haven
- Miscellaneous Business Product Repair, New Haven
- Miscellaneous Household Item Repair, New Haven
- Miscellaneous Agriculture, New Haven
- Miscellaneous Business Services, New Haven
- Miscellaneous Government, New Haven
- Miscellaneous Industry, New Haven
- Miscellaneous Manufacturing, New Haven
- Miscellaneous Metal Work Manufacturers, New Haven
- Miscellaneous Personal Services, New Haven
- Miscellaneous Photographers, New Haven
- Miscellaneous Professional, New Haven
- Mobile Home Parks & Communities , New Haven
- Money Transfer Service, New Haven
- Mortgage Bankers & Correspondents, New Haven
- Mortgage Companies, New Haven
- Mortgage Contracts & Services, New Haven
- Mortgages & Loans, New Haven
- Moth Proofing Services, New Haven
- Motion Picture Pre & Post Production Services, New Haven
- Motor Homes Renting & Leasing, New Haven
- Motor Vehicle, New Haven
- Motor Vehicle Rental & Leasing, New Haven
- Motorcycle Parts, Accessories & Dealers, New Haven
- Motorcycle Repair & Service, New Haven
- Motorcycles Paint & Refinishing, New Haven
- Mountain & Rock Climbing Instruction, New Haven
- Movie Theaters, New Haven
- Moving & Storage Supplies & Equipment, New Haven
- Moving Companies, New Haven
- Moving Supplies & Equipment Rental, New Haven
- Moving Truck Rental , New Haven
- Muffler Shop & Exhaust Systems, New Haven
- Museums, New Haven
- Music, New Haven
- Music Entertainment, New Haven
- Music Lessons, New Haven
- Music Lessons - Instrumental, New Haven
- Music Production Services, New Haven
- Musical Instrument Rental, New Haven - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, New Haven
- Musical Instruments Repair, Sales & Service, New Haven
- Musical Recording Services, New Haven
- Musicians, Bands & Disc Jockeys, New Haven
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