- Mail Delivery Service, Adamstown
- Mailboxes Retail, Adamstown
- Management Consultants & Services, Adamstown
- Manufacturers Agents & Representatives, Adamstown
- Manufacturers Representative, Adamstown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Adamstown
- Manufacturing Products, Adamstown
- Medical & Health Service Organizations, Adamstown
- Medical Diagnostic Clinics, Adamstown - Clinical Labs & Centers
- Medical Supplies & Equipment, Adamstown
- Men's & Boys Clothing & Accessories Stores, Adamstown
- Mennonite Church, Adamstown
- Mens & Boys Hats, Gloves & Neckwear, Adamstown
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- Mini & Self Storage, Adamstown
- Miscellaneous Government, Adamstown
- Miscellaneous Manufacturing, Adamstown
- Miscellaneous Personal Services, Adamstown
- Miscellaneous Professional, Adamstown
- Motor Vehicle, Adamstown
- Motor Vehicle Rental & Leasing, Adamstown
- Moving Truck Rental , Adamstown
- Music, Adamstown
- Music Lessons, Adamstown
- Music Lessons - Instrumental, Adamstown
- Music Schools, Adamstown
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