- Machine Shop, Middletown
- Machine Shop & Tool Repair Service, Middletown
- Machinery And Equipment Manufacturers, Middletown
- Machinery, Supplies & Equipment - Business Production Related, Middletown
- Machinery, Supplies & Equipment - Business Supplies Related, Middletown
- Machinery, Supplies & Equipment - Construction & Contractor Related, 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
- Marriage & Family Counselors, Middletown
- Martial Arts & Self Defense Schools, Middletown
- Masonry Contractors, Middletown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Middletown
- Massage Therapists & Professional, Middletown
- Massage Therapy, Middletown
- Mastectomy Apparel, Forms, Prostheses & Supplies, Middletown
- Material Handling & Heavy Machinery & Equipment, Middletown
- Maternity Clothes & Clothing Stores, Middletown - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Middletown
- Mechanical Contractors, Middletown - Install, Service & Repair
- Medical & Health Service Organizations, Middletown
- Medical Billing Services, Middletown
- Medical Diagnostic Clinics, Middletown - Clinical Labs & Centers
- Medical Equipment Manufacturers, Middletown
- Medical Supplies & Equipment, Middletown
- Membership Sports & Recreation Clubs, Middletown
- Men's & Boys Clothing & Accessories Stores, Middletown
- Men's Clothing Stores, Middletown - Clothes & Accessories
- Men's Shoe Stores, Middletown
- Mens & Boys Jeans & Western Wear Stores, Middletown
- Mental & Developmental Information & Referral Services, Middletown
- Mental Health Specialists, Middletown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Middletown
- Metal Boxes & Containers, Middletown
- Metal Buildings, Middletown - Kits, Homes, Steel Buildings, etc
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- Metal Cans Manufacturers, Middletown
- Metal Plating & Polishing, Middletown
- Metal Repair Service & Blacksmith, Middletown - Iron Works
- Methodist Church, Middletown
- Mexican Restaurants, Middletown
- Middle Eastern Restaurants, Middletown
- Midwives, Middletown
- Millwork Contractors, Middletown
- Mini & Self Storage, Middletown
- Miscellaneous Business Product Repair, Middletown
- Miscellaneous Household Item Repair, Middletown
- Miscellaneous Prosthesis & Appliances, Middletown
- Miscellaneous Agriculture, Middletown
- Miscellaneous Business Services, Middletown
- Miscellaneous Government, Middletown
- Miscellaneous Manufacturing, Middletown
- Miscellaneous Personal Services, Middletown
- Miscellaneous Photographers, Middletown
- Miscellaneous Professional, Middletown
- Mission Churches, Middletown
- Mobile Home Parks & Communities , Middletown
- Money Transfer Service, Middletown
- Monuments, Tombstones, Markers & Memorials, Middletown
- Mortgage Bankers & Correspondents, Middletown
- Mortgages & Loans, Middletown
- Motion Picture Pre & Post Production Services, 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 Supplies & Equipment Rental, Middletown
- Moving Truck Rental , Middletown
- Muffler Shop & Exhaust Systems, Middletown
- Museums, Middletown
- Music, Middletown
- Music Entertainment, Middletown
- Musical Instrument Rental, Middletown - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Middletown
- Musical Instruments Repair, Sales & Service, Middletown
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