- Machine Shop, Middletown
- Machine Shop & Tool Repair Service, Middletown
- Machine Shop Equipment & Supplies, Middletown
- Machine Tool Repair & Rebuild, Middletown
- Machinery Repair & Rebuild, Middletown
- Machinery, Supplies & Equipment - Business Production Related, Middletown
- Machinery, Supplies & Equipment - Business Supplies Related, Middletown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Middletown
- Magazine & Newspaper Stands, Middletown - Dealers & Distributors
- Mail Receiving & Forwarding Service, Middletown
- Mailbox Rental Services, Middletown
- Mailing, Delivery & Courier Service, Middletown
- Major Appliances, Middletown - Household & Kitchen
- Malls & Shopping Centers, Middletown
- Mammography Clinics, Middletown - Breast Cancer Screening
- Management Consultants & Services, Middletown
- Manicurists & Pedicurists, Middletown
- Manufacturers Agents & Representatives, Middletown
- Manufacturers Representative, Middletown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Middletown
- Manufacturing & Industrial Consultants, Middletown
- Manufacturing Products, Middletown
- Marinas & Marina Services, Middletown
- Marriage & Family Counselors, Middletown
- Masonry Contractors, Middletown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Middletown
- Mass Transit Vehicle Dealers, Middletown
- Material Handling Equipment, Middletown - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, Middletown
- Mechanical Contractors, Middletown - Install, Service & Repair
- Medical & Dental Management, Middletown
- Medical & Infectious Waste Disposal, Middletown
- Medical Diagnostic Clinics, Middletown - Clinical Labs & Centers
- Medical Records Service , Middletown
- Medical Supplies & Equipment, Middletown
- Membership Sports & Recreation Clubs, Middletown
- Mental Health Clinics, Middletown - Treatment Centers
- Mental Health Specialists, Middletown - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Middletown - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Middletown
- Metal Cutting Machines, Middletown
- Metal Cutting Services, Middletown
- Metal Finishers, Middletown
- Metal Plating & Polishing, Middletown
- Metal Products, Middletown
- Metal Services, Middletown
- Metal Specialties, Middletown
- Metal Stampings Manufacturers, Middletown
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- Metal Working Machinery, Middletown
- Metals Base, Middletown
- Methodist Church, Middletown
- Mexican Restaurants, Middletown
- Millwork Contractors, Middletown
- Millwork Manufacturers, Middletown
- Mini & Self Storage, Middletown
- Mining, Middletown
- Miscellaneous Household Item Repair, Middletown
- Miscellaneous Agriculture, Middletown
- Miscellaneous Government, Middletown
- Miscellaneous Industry, Middletown
- Miscellaneous Manufacturing, Middletown
- Miscellaneous Metal Work Manufacturers, Middletown
- Miscellaneous Personal Services, Middletown
- Miscellaneous Photographers, Middletown
- Miscellaneous Professional, Middletown
- Mission Churches, Middletown
- Mobile Home Parks & Communities , Middletown
- Modeling & Talent Agencies, Middletown
- Money Transfer Service, Middletown
- Monuments, Tombstones, Markers & Memorials, Middletown
- Mortgage Bankers & Correspondents, Middletown
- Mortgages & Loans, Middletown
- Motor Vehicle, Middletown
- Motor Vehicle Rental & Leasing, Middletown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Middletown
- Motorcycle Parts, Accessories & Dealers, Middletown
- Motorcycle Repair & Service, Middletown
- Movie Theaters, Middletown
- Moving & Storage Supplies & Equipment, Middletown
- Moving Companies, Middletown
- Moving Services - Labor & Material, Middletown
- Moving Supplies & Equipment Rental, Middletown
- Moving Truck Rental , Middletown
- Muffler Shop & Exhaust Systems, Middletown
- Mulch, Peat & Moss Products, Middletown
- Music, Middletown
- Music Entertainment, Middletown
- Music Lessons, Middletown
- Music Lessons - Instrumental, Middletown
- Music Schools, Middletown
- Musical Instrument Rental, Middletown - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Middletown
- Musical Instruments Repair, Sales & Service, Middletown
- Musical Recording Services, Middletown
- Musicians, Bands & Disc Jockeys, Middletown
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