- Machine Shop, Philadelphia
- Machine Shop & Tool Repair Service, Philadelphia
- Machine Tool Repair & Rebuild, Philadelphia
- Machine Tools , Philadelphia
- Machinery And Equipment Manufacturers, Philadelphia
- Machinery Custom Design Manufacturers, Philadelphia
- Machinery Movers & Erectors, Philadelphia
- Machinery Repair & Rebuild, Philadelphia
- Machinery, Supplies & Equipment - Business Production Related, Philadelphia
- Machinery, Supplies & Equipment - Business Supplies Related, Philadelphia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Philadelphia
- Magazine & Newspaper Stands, Philadelphia - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Philadelphia
- Magnetic & Optical Recording Media Manufacturers, Philadelphia
- Mail Delivery Service, Philadelphia
- Mailbox Rental Services, Philadelphia
- Mailing, Delivery & Courier Service, Philadelphia
- Maintenance, Cleaning & Sanitation, Philadelphia
- Major Appliance Repair & Service, Philadelphia
- Major Appliances, Philadelphia - Household & Kitchen
- Make Up & Cosmetics Application, Philadelphia
- Malaysian Restaurants, Philadelphia
- Malls & Shopping Centers, Philadelphia
- Malpractice Attorneys & Lawyers, Philadelphia
- Malpractice Attorneys & Lawyers, Philadelphia
- Malpractice Lawyers & Attorneys, Philadelphia
- Management Consultants & Services, Philadelphia
- Management Training Schools, Philadelphia
- Mandarin Restaurants, Philadelphia
- Manicurists & Pedicurists, Philadelphia
- Manufacturers Agents & Representatives, Philadelphia
- Manufacturers Representative, Philadelphia - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Philadelphia
- Manufacturing & Industrial Consultants, Philadelphia
- Manufacturing Equipment & Supplies, Philadelphia
- Manufacturing Products, Philadelphia
- Marble, Philadelphia
- Marble Contractors, Philadelphia - Installation, Cleaning & Removal Services
- Marinas & Aquariums, Philadelphia
- Marinas & Marina Services, Philadelphia
- Marine Cargo Handling, Philadelphia
- Marine Electronic Equipment, Philadelphia
- Marine Engineers, Philadelphia
- Marine Hardware, Philadelphia
- Marine Instruments, Philadelphia - Nautical Instruments
- Marine Lifts, Launching & Recovery, Philadelphia
- Marine Products And Services, Philadelphia
- Marine Repair & Service Stations, Philadelphia
- Marine Services, Philadelphia
- Marine Supplies & Equipment, Philadelphia - Boat Supplies
- Marine Supplies & Equipment Repair, Philadelphia - Boat Supplies & Equipment
- Marionettes & Puppets, Philadelphia
- Market Research & Analysis , Philadelphia - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Philadelphia
- Marketing Schools, Philadelphia
- Marriage & Family Counselors, Philadelphia
- Marriage & Family Counselors Information & Referrals, Philadelphia
- Marriage Officiant, Philadelphia
- Martial Arts & Self Defense Schools, Philadelphia
- Mary Kay Cosmetics, Philadelphia
- Masonry Contractors, Philadelphia - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Philadelphia
- Masonry Materials & Supplies, Philadelphia
- Mass Transit Vehicle Dealers, Philadelphia
- Massage Equipment & Supplies, Philadelphia
- Massage Therapists & Professional, Philadelphia
- Massage Therapy, Philadelphia
- Mastectomy Apparel, Forms, Prostheses & Supplies, Philadelphia
- Material Handling, Philadelphia
- Material Handling & Heavy Machinery & Equipment, Philadelphia
- Material Handling Equipment, Philadelphia - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Philadelphia - Maternity Dress, Gown, Swimwear, Underwear & More
- Mausoleum Builders, Philadelphia
- Mausoleums Developers, Philadelphia
- Meat Market, Wholesale & Products, Philadelphia
- Meat Markets Kosher, Philadelphia
- Mechanical Contractors, Philadelphia - Install, Service & Repair
- Mechanical Engineer, Philadelphia - Mechanical Engineering Service
- Medical & Dental Management, Philadelphia
- Medical & Health Service Organizations, Philadelphia
- Medical & Infectious Waste Disposal, Philadelphia
- Medical Alert Systems, Philadelphia - Medical Alarms - PERS
- Medical Billing & Claims Management, Philadelphia
- Medical Billing Services, Philadelphia
- Medical Diagnostic Clinics, Philadelphia - Clinical Labs & Centers
- Medical Diagnostic Imaging, Philadelphia
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Philadelphia
- Medical Examiner, Philadelphia - Doctors, Physicians & Surgeons
- Medical Groups & Clinics, Philadelphia - Medical & Health Centers
- Medical Management & Business Administration Service, Philadelphia
- Medical Research, Philadelphia
- Medical Research & Development, Philadelphia - Medical Information & Research
- Medical Research Facilities, Philadelphia - Research & Development Centers
- Medical Supplements, Philadelphia
- Medical Supplies & Equipment, Philadelphia
- Medical Transcription Service, Philadelphia
- Mediterranean Restaurants, Philadelphia
- Meeting & Event Planning Services, Philadelphia - Conference Consultants
- Membership Sports & Recreation Clubs, Philadelphia
- Men's & Boys Clothing & Accessories Stores, Philadelphia
- Men's Clothing Stores, Philadelphia - Clothes & Accessories
- Men's Shoe Stores, Philadelphia
- Mennonite Church, Philadelphia
- Mens & Boys Belts & Suspenders, Philadelphia
- Mens & Boys Hats, Gloves & Neckwear, Philadelphia
- Mens & Womens Clothing, Philadelphia
- Mental & Developmental Information & Referral Services, Philadelphia
- Mental Health Clinics, Philadelphia - Treatment Centers
- Mental Health Specialists, Philadelphia - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Philadelphia
- Merchandise Sales Events, Philadelphia
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- Merchandising & Marketing Consultants, Philadelphia
- Messenger Service, Philadelphia - Message Receiving & Forwarding Service
- Messianic Synagogues, Philadelphia
- Metal Boxes & Containers, Philadelphia
- Metal Buildings, Philadelphia - Kits, Homes, Steel Buildings, etc
- Metal Cans Manufacturers, Philadelphia
- Metal Coating & Allied Services, Philadelphia
- Metal Detecting Equipment, Philadelphia
- Metal Distributors, Philadelphia
- Metal Finishers, Philadelphia
- Metal Heat Treating, Philadelphia
- Metal Plating & Polishing, Philadelphia
- Metal Repair Service & Blacksmith, Philadelphia - Iron Works
- Metal Services, Philadelphia
- Metal Stampings Manufacturers, Philadelphia
- Metaphysical Churches, Philadelphia
- Methodist Church, Philadelphia
- Metropolitan Church, Philadelphia
- Mexican Restaurants, Philadelphia
- Microfilm & Imaging Service, Equipment & Supplies , Philadelphia
- Microwave Oven Repair & Service, Philadelphia
- Middle Eastern Restaurants, Philadelphia
- Midwives, Philadelphia
- Mildew Removal & Control, Philadelphia - Mold Removal
- Military And Veteran Attorneys & Lawyers, Philadelphia
- Military And Veteran Attorneys & Lawyers, Philadelphia
- Military And Veteran Lawyers & Attorneys, Philadelphia
- Millwork Contractors, Philadelphia
- Millwork Contractors, Philadelphia
- Millwrights, Philadelphia
- Mini & Self Storage, Philadelphia
- Mini Golf Courses, Philadelphia
- Mining, Philadelphia
- Ministers, Philadelphia
- Ministries Church, Philadelphia
- Mirrors, Philadelphia - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Philadelphia
- Miscellaneous Business Manufacturing, Philadelphia
- Miscellaneous Business Product Repair, Philadelphia
- Miscellaneous Household Item Repair, Philadelphia
- Miscellaneous Prosthesis & Appliances, Philadelphia
- Miscellaneous Agriculture, Philadelphia
- Miscellaneous Business Services, Philadelphia
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Philadelphia
- Miscellaneous Government, Philadelphia
- Miscellaneous Industry, Philadelphia
- Miscellaneous Jewelry, Philadelphia
- Miscellaneous Manufacturing, Philadelphia
- Miscellaneous Metal Work Manufacturers, Philadelphia
- Miscellaneous Personal Services, Philadelphia
- Miscellaneous Photographers, Philadelphia
- Miscellaneous Professional, Philadelphia
- Mission Churches, Philadelphia
- Mobile Communications 2 Way Radios Sales & Service, Philadelphia
- Modeling & Talent Agencies, Philadelphia
- Modular & Mobile Homes For Sale, Philadelphia - Manufactured Homes Sale & Service
- Money Counting & Wrapping, Philadelphia
- Money Transfer Service, Philadelphia
- Monuments Cleaning, Philadelphia
- Monuments, Tombstones, Markers & Memorials, Philadelphia
- Mopeds & Motor Scooters Rental, Philadelphia
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Philadelphia
- Moravian Churches, Philadelphia
- Moroccan Restaurants, Philadelphia
- Mortgage Bankers & Correspondents, Philadelphia
- Mortgages & Loans, Philadelphia
- Mortgages Commercial & Industrial, Philadelphia
- Mosques, Philadelphia
- Mosquito Control, Philadelphia
- Moth Proofing Services, Philadelphia
- Motion Picture & Television Production Services, Philadelphia
- Motion Picture Dists & Producers, Philadelphia
- Motion Picture Film Libraries, Philadelphia
- Motion Picture Pre & Post Production Services, Philadelphia
- Motion Pictures Video Tape Duplication & Transfer Services, Philadelphia
- Motor Sports, Philadelphia
- Motor Vehicle, Philadelphia
- Motor Vehicle Rental & Leasing, Philadelphia
- Motorcycle & Motor Scooters Dealers, Repair & Service, Philadelphia
- Motorcycle Machine Shop Service, Philadelphia
- Motorcycle Parts, Accessories & Dealers, Philadelphia
- Motorcycle Repair & Service, Philadelphia
- Motorcycles Paint & Refinishing, Philadelphia
- Motorized Bicycle & Scooter, Philadelphia
- Movie Theaters, Philadelphia
- Moving & Storage Consultants, Philadelphia
- Moving & Storage Supplies & Equipment, Philadelphia
- Moving Companies, Philadelphia
- Moving Services - Labor & Material, Philadelphia
- Moving Supplies & Equipment Rental, Philadelphia
- Moving Truck Rental , Philadelphia
- Muffler Shop & Exhaust Systems, Philadelphia
- Mulch, Peat & Moss Products, Philadelphia
- Multimedia Publishers, Philadelphia - Multimedia Services & Systems
- Museums, Philadelphia
- Museums Arboretums, Philadelphia
- Music, Philadelphia
- Music Entertainment, Philadelphia
- Music Lessons, Philadelphia
- Music Lessons - Instrumental, Philadelphia
- Music Schools, Philadelphia
- Music Therapy, Philadelphia
- Musical Instrument Manufacturers, Philadelphia
- Musical Instrument Rental, Philadelphia - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Philadelphia
- Musical Instruments - Violins, Philadelphia
- Musical Instruments Repair, Sales & Service, Philadelphia
- Musical Recording Services, Philadelphia
- Musicians, Bands & Disc Jockeys, Philadelphia
- Muslim Church, Philadelphia
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