PO Box only ZIP Codes refer to ZIP Codes assigned solely for use with P.O. Box addresses at a specific post office. These ZIP Codes do not correspond to physical addresses and are used by postal services to route mail exclusively to P.O. Boxes. Residents or businesses that use a P.O. Box in these areas receive their mail at the postal facility rather than a street address. PO Box only ZIP Codes ensure that mail is accurately delivered to the correct P.O. Box in areas where street delivery is either unavailable or not practical.
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