What are Post Office Box-only ZIP Codes? - PostGrid

TABLE OF CONTENTS REQUEST A DEMO PO Box–Only ZIP Codes ZIP codes play a crucial role in ensuring your postal mails are processed efficiently without any delays or bottlenecks. The ZIP codes enable postal services like USPS to easily identify and …

source https://www.postgrid.com/po-box-only-zip-codes/

source https://byronnoell.blogspot.com/2021/04/what-are-post-office-box-only-zip-codes.html