- Machine Guards, Pittsburgh
- Machine Shop, Pittsburgh
- Machine Shop & Tool Repair Service, Pittsburgh
- Machine Shop Rotary Surface Grinding, Pittsburgh - Tool Grinding & Sharpening
- Machine Shops Slings, Pittsburgh
- Machine Tools , Pittsburgh
- Machinery And Equipment Manufacturers, Pittsburgh
- Machinery Movers & Erectors, Pittsburgh
- Machinery, Supplies & Equipment - Business Production Related, Pittsburgh
- Machinery, Supplies & Equipment - Business Supplies Related, Pittsburgh
- Machinery, Supplies & Equipment - Construction & Contractor Related, Pittsburgh
- Magazine & Newspaper Stands, Pittsburgh - Dealers & Distributors
- Magazine Ads, Pittsburgh - Periodical Advertising
- Magicians & Hypnotist Entertainers, Pittsburgh
- Magicians & Jugglers Equipment & Supplies, Pittsburgh
- Magnetic & Optical Recording Media Manufacturers, Pittsburgh
- Magnetic Devices, Pittsburgh
- Magnets & Magnetic Devices, Pittsburgh
- Mail Delivery Service, Pittsburgh
- Mailbox Rental Services, Pittsburgh
- Mailboxes Retail, Pittsburgh
- Mailing List Service, Brokers & Compilers, Pittsburgh
- Mailing, Delivery & Courier Service, Pittsburgh
- Maintenance, Cleaning & Sanitation, Pittsburgh
- Major Appliance Parts, Pittsburgh
- Major Appliance Repair & Service, Pittsburgh
- Major Appliances, Pittsburgh - Household & Kitchen
- Majorette Supplies, Pittsburgh
- Make Up & Cosmetics Application, Pittsburgh
- Malls & Shopping Centers, Pittsburgh
- Malpractice Attorneys & Lawyers, Pittsburgh
- Malpractice Attorneys & Lawyers, Pittsburgh
- Malpractice Lawyers & Attorneys, Pittsburgh
- Mammography Clinics, Pittsburgh - Breast Cancer Screening
- Management Consultants & Services, Pittsburgh
- Management Training & Development, Pittsburgh
- Mandarin Restaurants, Pittsburgh
- Manicurists & Pedicurists, Pittsburgh
- Manifold Business Forms Manufacturers, Pittsburgh
- Manufacturers Agents & Representatives, Pittsburgh
- Manufacturers Representative, Pittsburgh - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Pittsburgh
- Manufacturing & Industrial Consultants, Pittsburgh
- Manufacturing Equipment & Supplies, Pittsburgh
- Manufacturing Products, Pittsburgh
- Manufacturing Services, Pittsburgh
- Maps & Supplies, Pittsburgh
- Marble, Pittsburgh
- Marble Contractors, Pittsburgh - Installation, Cleaning & Removal Services
- Marinas & Aquariums, Pittsburgh
- Marinas & Marina Services, Pittsburgh
- Marine Cargo Handling, Pittsburgh
- Marine Contractors & Designers, Pittsburgh
- Marine Electronic Equipment, Pittsburgh
- Marine Products And Services, Pittsburgh
- Marine Salvage & Wrecking Services, Pittsburgh
- Marine Services, Pittsburgh
- Marine Supplies & Equipment, Pittsburgh - Boat Supplies
- Market Research & Analysis , Pittsburgh - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Pittsburgh
- Marketing Schools, Pittsburgh
- Markets & Grocers Equipment, Pittsburgh
- Marriage & Family Counselors, Pittsburgh
- Marriage & Family Counselors Information & Referrals, Pittsburgh
- Martial Arts & Self Defense Schools, Pittsburgh
- Masonry Contractors, Pittsburgh - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Pittsburgh
- Massage Parlor & Steam Bath Services, Pittsburgh
- Massage Therapists & Professional, Pittsburgh
- Massage Therapy, Pittsburgh
- Mastectomy Apparel, Forms, Prostheses & Supplies, Pittsburgh
- Material Handling & Heavy Machinery & Equipment, Pittsburgh
- Material Handling Equipment, Pittsburgh - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Pittsburgh - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Pittsburgh
- Mattress & Bedspring Manufacturers, Pittsburgh
- Mausoleum Builders, Pittsburgh
- Mausoleums Developers, Pittsburgh
- Meat Brokers, Pittsburgh
- Meat Market, Wholesale & Products, Pittsburgh
- Meat Markets Kosher, Pittsburgh
- Mechanical Contractors, Pittsburgh - Install, Service & Repair
- Mechanical Engineer, Pittsburgh - Mechanical Engineering Service
- Mechanical Seals, Pittsburgh
- Medical & Dental Assistant Schools, Pittsburgh
- Medical & Dental Management, Pittsburgh
- Medical & Health Service Organizations, Pittsburgh
- Medical & Infectious Waste Disposal, Pittsburgh
- Medical Alert Systems, Pittsburgh - Medical Alarms - PERS
- Medical Billing Services, Pittsburgh
- Medical Business Management Services, Pittsburgh
- Medical Diagnostic Clinics, Pittsburgh - Clinical Labs & Centers
- Medical Equipment & Supplies Rental & Leasing, Pittsburgh
- Medical Equipment Manufacturers, Pittsburgh
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Pittsburgh
- Medical Groups & Clinics, Pittsburgh - Medical & Health Centers
- Medical Identification Jewelry, Pittsburgh
- Medical Management & Business Administration Service, Pittsburgh
- Medical Records Service , Pittsburgh
- Medical Reimbursement Services, Pittsburgh
- Medical Research, Pittsburgh
- Medical Research & Development, Pittsburgh - Medical Information & Research
- Medical Research Facilities, Pittsburgh - Research & Development Centers
- Medical Supplements, Pittsburgh
- Medical Supplies & Equipment, Pittsburgh
- Medical Transcription Service, Pittsburgh
- Mediterranean Restaurants, Pittsburgh
- Meeting & Event Planning Services, Pittsburgh - Conference Consultants
- Membership Sports & Recreation Clubs, Pittsburgh
- Men's & Boys Clothing & Accessories Stores, Pittsburgh
- Men's Clothing Stores, Pittsburgh - Clothes & Accessories
- Men's Shoe Stores, Pittsburgh
- Mennonite Church, Pittsburgh
- Mens & Boys Belts & Suspenders, Pittsburgh
- Mens & Boys Hats, Gloves & Neckwear, Pittsburgh
- Mental & Developmental Information & Referral Services, Pittsburgh
- Mental Health Clinics, Pittsburgh - Treatment Centers
- Mental Health Specialists, Pittsburgh - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Pittsburgh
- Merchandise Sales Events, Pittsburgh
- Merchandising & Marketing Consultants, Pittsburgh
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- Merchandising & Pricing Equipment, Pittsburgh
- Merger & Acquisition Services, Pittsburgh
- Merle Norman Cosmetics, Pittsburgh
- Messenger Service, Pittsburgh - Message Receiving & Forwarding Service
- Messianic Synagogues, Pittsburgh
- Metal Coating & Allied Services, Pittsburgh
- Metal Galvanizing, Pittsburgh
- Metal Goods Alloys, Pittsburgh
- Metal Heat Treating, Pittsburgh
- Metal Lockers, Pittsburgh
- Metal Pails, Drums & Barrel Manufacturers, Pittsburgh
- Metal Plating & Polishing, Pittsburgh
- Metal Powder Products, Pittsburgh
- Metal Products, Pittsburgh
- Metal Repair Service & Blacksmith, Pittsburgh - Iron Works
- Metal Roofs, Pittsburgh
- Metal Specialties, Pittsburgh
- Metal Stampings Manufacturers, Pittsburgh
- Metal Tanks, Pittsburgh
- Metal Working Machinery, Pittsburgh
- Metallurgical Testing Labs, Pittsburgh
- Metals Base, Pittsburgh
- Metals Corrugated, Pittsburgh
- Metaphysical Churches, Pittsburgh
- Methodist Church, Pittsburgh
- Mexican Food, Pittsburgh
- Mexican Restaurants, Pittsburgh
- Microfilm & Imaging Service, Equipment & Supplies , Pittsburgh
- Microwave Ovens, Pittsburgh
- Middle Eastern Restaurants, Pittsburgh
- Midwives, Pittsburgh
- Mildew Removal & Control, Pittsburgh - Mold Removal
- Military Supplies, Pittsburgh
- Millwork Contractors, Pittsburgh
- Minerals, Pittsburgh
- Mini & Self Storage, Pittsburgh
- Mini Golf Courses, Pittsburgh
- Mining, Pittsburgh
- Mining Contractors, Pittsburgh - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Pittsburgh
- Mining Equipment & Supplies Service & Repair, Pittsburgh
- Mining, Crude-Oil Production, Pittsburgh - Mining Companies
- Ministers, Pittsburgh
- Ministries Church, Pittsburgh
- Mirrors, Pittsburgh - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Pittsburgh
- Miscellaneous Business Product Repair, Pittsburgh
- Miscellaneous Household Item Repair, Pittsburgh
- Miscellaneous Prosthesis & Appliances, Pittsburgh
- Miscellaneous Retail Stores, Pittsburgh
- Miscellaneous Agriculture, Pittsburgh
- Miscellaneous Business Services, Pittsburgh
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Pittsburgh
- Miscellaneous Government, Pittsburgh
- Miscellaneous Industry, Pittsburgh
- Miscellaneous Manufacturing, Pittsburgh
- Miscellaneous Metal Work Manufacturers, Pittsburgh
- Miscellaneous Personal Services, Pittsburgh
- Miscellaneous Photographers, Pittsburgh
- Miscellaneous Professional, Pittsburgh
- Mission Churches, Pittsburgh
- Mobile Home Contractors, Pittsburgh
- Mobile Home Improvements & Repairs, Pittsburgh
- Mobile Home Parks & Communities , Pittsburgh
- Modeling & Talent Agencies, Pittsburgh
- Modular & Mobile Homes For Sale, Pittsburgh - Manufactured Homes Sale & Service
- Modular Buildings, Pittsburgh - Modular Homes Buildings & Offices
- Moldings Materials, Pittsburgh
- Molds, Pittsburgh
- Money Counting & Wrapping, Pittsburgh
- Mongolian Restaurants, Pittsburgh
- Monuments Cleaning, Pittsburgh
- Monuments, Tombstones, Markers & Memorials, Pittsburgh
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Pittsburgh
- Mortgage Bankers & Correspondents, Pittsburgh
- Mortgage Brokers, Pittsburgh
- Mortgage Companies, Pittsburgh
- Mortgage Loan Processors, Pittsburgh
- Mortgages & Loans, Pittsburgh
- Mosques, Pittsburgh
- Motion Picture & Television Production Services, Pittsburgh
- Motion Picture Dists & Producers, Pittsburgh
- Motion Picture Equipment & Supplies, Pittsburgh
- Motion Picture Pre & Post Production Services, Pittsburgh
- Motion Pictures Video Tape Duplication & Transfer Services, Pittsburgh
- Motivational & Self Improvement Schools, Pittsburgh
- Motor Vehicle, Pittsburgh
- Motor Vehicle Rental & Leasing, Pittsburgh
- Motorcycle & Motor Scooters Dealers, Repair & Service, Pittsburgh
- Motorcycle Parts, Accessories & Dealers, Pittsburgh
- Motorcycle Repair & Service, Pittsburgh
- Motorcycles Paint & Refinishing, Pittsburgh
- Mountain & Ice Climbing Tours, Pittsburgh
- Movie Theaters, Pittsburgh
- Moving & Storage Consultants, Pittsburgh
- Moving & Storage Supplies & Equipment, Pittsburgh
- Moving Companies, Pittsburgh
- Moving Services - Labor & Material, Pittsburgh
- Moving Supplies & Equipment Rental, Pittsburgh
- Moving Truck Rental , Pittsburgh
- Muffler Shop & Exhaust Systems, Pittsburgh
- Mulch, Peat & Moss Products, Pittsburgh
- Multimedia Publishers, Pittsburgh - Multimedia Services & Systems
- Murals & Faux Finish Walls, Pittsburgh
- Museums, Pittsburgh
- Music, Pittsburgh
- Music Entertainment, Pittsburgh
- Music Lessons, Pittsburgh
- Music Lessons - Instrumental, Pittsburgh
- Music Schools, Pittsburgh
- Music Sheet, Pittsburgh
- Music Stores Retail, Pittsburgh
- Musical Instrument Rental, Pittsburgh - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Pittsburgh
- Musical Instruments - Microphones, Pittsburgh
- Musical Instruments - Violins, Pittsburgh
- Musical Instruments Repair, Sales & Service, Pittsburgh
- Musical Recording Services, Pittsburgh
- Musicians, Bands & Disc Jockeys, Pittsburgh
- Muslim Church, Pittsburgh
- Myofunctional Therapy, Pittsburgh
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