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In the context of Zip-Codes, “P” and “M” refer to specific classifications used by the United States Postal Service (USPS) to categorize types of postal facilities or mail services. Here’s a brief explanation of each:
Zip Class Code “P”:
The “P” classification stands for Post Office Box Only Zip Codes. These Zip Codes are designated for locations where mail is delivered exclusively to P.O. Boxes and not to street addresses. These areas might not have residential delivery services, so individuals and businesses must rent a P.O. Box to receive their mail. An example would be certain rural areas or specialized mail services where no street delivery is available.
Zip Class Code “M”:
The “M” classification refers to Military Zip Codes. These are used for mail being sent to or from U.S. military bases and installations, both domestically and internationally. Military Zip Codes ensure that mail sent to service members is routed correctly, regardless of their location around the world. These codes are part of the larger APO (Army Post Office), FPO (Fleet Post Office), and DPO (Diplomatic Post Office) system.
Understanding these classifications helps clarify the purpose and functionality of specific Zip Codes, enhancing the efficiency of mail delivery and ensuring that all areas, including specialized and remote ones, receive proper mail services.