- Machine Shop, Pottstown
- Machine Shop & Tool Repair Service, Pottstown
- Machine Shop Rotary Surface Grinding, Pottstown - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Pottstown
- Machinery Movers & Erectors, Pottstown
- Machinery, Supplies & Equipment - Business Production Related, Pottstown
- Machinery, Supplies & Equipment - Business Supplies Related, Pottstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Pottstown
- Magazine & Newspaper Stands, Pottstown - Dealers & Distributors
- Mailbox Rental Services, Pottstown
- Mailing, Delivery & Courier Service, Pottstown
- Maintenance, Cleaning & Sanitation, Pottstown
- Major Appliances, Pottstown - Household & Kitchen
- Malls & Shopping Centers, Pottstown
- Management Consultants & Services, Pottstown
- Manicurists & Pedicurists, Pottstown
- Manufacturers Agents & Representatives, Pottstown
- Manufacturers Representative, Pottstown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Pottstown
- Manufacturing Products, Pottstown
- Marine Supplies & Equipment, Pottstown - Boat Supplies
- Market Research & Analysis , Pottstown - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Pottstown
- Martial Arts & Self Defense Schools, Pottstown
- Masonry Contractors, Pottstown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Pottstown
- Massage Therapists & Professional, Pottstown
- Massage Therapy, Pottstown
- Meat Market, Wholesale & Products, Pottstown
- Mechanical Contractors, Pottstown - Install, Service & Repair
- Medical & Dental Management, Pottstown
- Medical & Health Service Organizations, Pottstown
- Medical Diagnostic Clinics, Pottstown - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Pottstown
- Medical Research Facilities, Pottstown - Research & Development Centers
- Medical Supplies & Equipment, Pottstown
- Meeting & Event Planning Services, Pottstown - Conference Consultants
- Membership Sports & Recreation Clubs, Pottstown
- Men's & Boys Clothing & Accessories Stores, Pottstown
- Men's Clothing Stores, Pottstown - Clothes & Accessories
- Men's Shoe Stores, Pottstown
- Mennonite Church, Pottstown
- Mens & Womens Clothing, Pottstown
- Mental Health Specialists, Pottstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Pottstown
- Messenger Service, Pottstown - Message Receiving & Forwarding Service
- Metal Bending & Straightening, Pottstown
- Metal Buildings, Pottstown - Wood Buildings
- Metal Buildings, Pottstown - Kits, Homes, Steel Buildings, etc
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- Metal Detecting Equipment, Pottstown
- Metal Distributors, Pottstown
- Metal Plating & Polishing, Pottstown
- Metal Repair Service & Blacksmith, Pottstown - Iron Works
- Metal Stampings Manufacturers, Pottstown
- Metaphysical Churches, Pottstown
- Methodist Church, Pottstown
- Mexican Restaurants, Pottstown
- Mildew Removal & Control, Pottstown - Mold Removal
- Mini & Self Storage, Pottstown
- Mining, Pottstown
- Miscellaneous Business Product Repair, Pottstown
- Miscellaneous Household Item Repair, Pottstown
- Miscellaneous Agriculture, Pottstown
- Miscellaneous Business Services, Pottstown
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Pottstown
- Miscellaneous Government, Pottstown
- Miscellaneous Industry, Pottstown
- Miscellaneous Manufacturing, Pottstown
- Miscellaneous Metal Work Manufacturers, Pottstown
- Miscellaneous Motor Vehicles, Pottstown
- Miscellaneous Personal Services, Pottstown
- Miscellaneous Photographers, Pottstown
- Miscellaneous Professional, Pottstown
- Moldings Materials, Pottstown
- Monuments, Tombstones, Markers & Memorials, Pottstown
- Mortgage Bankers & Correspondents, Pottstown
- Mortgage Companies, Pottstown
- Mortgages & Loans, Pottstown
- Motion Picture Pre & Post Production Services, Pottstown
- Motor Vehicle, Pottstown
- Motor Vehicle Rental & Leasing, Pottstown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Pottstown
- Motorcycle Parts, Accessories & Dealers, Pottstown
- Motorcycle Repair & Service, Pottstown
- Moving & Storage Supplies & Equipment, Pottstown
- Moving Companies, Pottstown
- Moving Supplies & Equipment Rental, Pottstown
- Moving Truck Rental , Pottstown
- Mulch, Peat & Moss Products, Pottstown
- Music, Pottstown
- Music Lessons, Pottstown
- Music Lessons - Instrumental, Pottstown
- Music Schools, Pottstown
- Music Therapy, Pottstown
- Musical Instrument Rental, Pottstown - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Pottstown
- Musical Instruments - Microphones, Pottstown
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