- Machine Shop & Tool Repair Service, Norristown
- Machine Tool Repair & Rebuild, Norristown
- Machinery And Equipment Manufacturers, Norristown
- Machinery, Supplies & Equipment - Business Production Related, Norristown
- Machinery, Supplies & Equipment - Business Supplies Related, Norristown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Norristown
- Magazine & Newspaper Stands, Norristown - Dealers & Distributors
- Mail Delivery Service, Norristown
- Mailbox Rental Services, Norristown
- Mailing, Delivery & Courier Service, Norristown
- Maintenance, Cleaning & Sanitation, Norristown
- Major Appliance Repair & Service, Norristown
- Major Appliances, Norristown - Household & Kitchen
- Malls & Shopping Centers, Norristown
- Management Consultants & Services, Norristown
- Manicurists & Pedicurists, Norristown
- Manufacturers Agents & Representatives, Norristown
- Manufacturers Representative, Norristown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Norristown
- Manufacturing Equipment & Supplies, Norristown
- Manufacturing Products, Norristown
- Manufacturing Services, Norristown
- Marble, Norristown
- Marble Contractors, Norristown - Installation, Cleaning & Removal Services
- Marble Tile, Norristown
- Marinas & Aquariums, Norristown
- Marriage & Family Counselors, Norristown
- Marriage Officiant, Norristown
- Martial Arts & Self Defense Schools, Norristown
- Masonry Contractors, Norristown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Norristown
- Massage Therapists & Professional, Norristown
- Massage Therapy, Norristown
- Mastectomy Apparel, Forms, Prostheses & Supplies, Norristown
- Material Handling & Heavy Machinery & Equipment, Norristown
- Material Handling Equipment, Norristown - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleum Builders, Norristown
- Meat Market, Wholesale & Products, Norristown
- Mechanical Contractors, Norristown - Install, Service & Repair
- Mechanical Engineer, Norristown - Mechanical Engineering Service
- Medical & Health Service Organizations, Norristown
- Medical Billing Services, Norristown
- Medical Diagnostic Clinics, Norristown - Clinical Labs & Centers
- Medical Equipment & Supplies Rental & Leasing, Norristown
- Medical Research, Norristown
- Medical Research & Development, Norristown - Medical Information & Research
- Medical Supplies & Equipment, Norristown
- Membership Sports & Recreation Clubs, Norristown
- Men's Clothing Stores, Norristown - Clothes & Accessories
- Mennonite Church, Norristown
- Mental & Developmental Information & Referral Services, Norristown
- Mental Health Clinics, Norristown - Treatment Centers
- Mental Health Specialists, Norristown - Psychologist, Psychiatrist, Psychotherapist, etc
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- Mental Retardation & Developmentally Disabled Services, Norristown
- Merchandise Sales Events, Norristown
- Messenger Service, Norristown - Message Receiving & Forwarding Service
- Messianic Synagogues, Norristown
- Metal Plating & Polishing, Norristown
- Metal Specialties, Norristown
- Metal Tanks, Norristown
- Methodist Church, Norristown
- Mexican Food & Goods Products, Norristown
- Mexican Restaurants, Norristown
- Middle Eastern Restaurants, Norristown
- Mildew Removal & Control, Norristown - Mold Removal
- Millwork Contractors, Norristown
- Mini & Self Storage, Norristown
- Mining, Norristown
- Miscellaneous Business Product Repair, Norristown
- Miscellaneous Household Item Repair, Norristown
- Miscellaneous Agriculture, Norristown
- Miscellaneous Business Services, Norristown
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Norristown
- Miscellaneous Government, Norristown
- Miscellaneous Industry, Norristown
- Miscellaneous Manufacturing, Norristown
- Miscellaneous Personal Services, Norristown
- Miscellaneous Photographers, Norristown
- Miscellaneous Professional, Norristown
- Mobile Homes Manufacturers Supplies & Equipment, Norristown
- Modular & Mobile Homes For Sale, Norristown - Manufactured Homes Sale & Service
- Money Transfer Service, Norristown
- Monuments, Tombstones, Markers & Memorials, Norristown
- Mortgage Bankers & Correspondents, Norristown
- Mortgages & Loans, Norristown
- Mosques, Norristown
- Motion Picture Pre & Post Production Services, Norristown
- Motor Vehicle, Norristown
- Motor Vehicle Rental & Leasing, Norristown
- Motorcycle Parts, Accessories & Dealers, Norristown
- Movie Theaters, Norristown
- Moving & Storage Supplies & Equipment, Norristown
- Moving Companies, Norristown
- Moving Services - Labor & Material, Norristown
- Moving Supplies & Equipment Rental, Norristown
- Moving Truck Rental , Norristown
- Muffler Shop & Exhaust Systems, Norristown
- Mulch, Peat & Moss Products, Norristown
- Multimedia Publishers, Norristown - Multimedia Services & Systems
- Music, Norristown
- Music Background Leased, Norristown
- Music Entertainment, Norristown
- Music Schools, Norristown
- Musical Instrument Rental, Norristown - Band & Orchestra Instruments
- Musical Recording Services, Norristown
- Musicians, Bands & Disc Jockeys, Norristown
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