usps priority mail to a po box is a service that allows customers to send packages to a P.O. Box address using USPS Priority Mail. Priority Mail typically delivers within 1 to 3 business days, depending on the destination, and includes tracking, insurance, and delivery confirmation. P.O. Boxes can be used for mail delivery in areas where street addresses are not available or for individuals who prefer to receive mail securely. USPS Priority Mail to a P.O. Box is a convenient way to send important packages quickly and reliably.