The cost of renting a PO box depends on three factors: the length of time it will be rented, the size of the box, and its physical location. According to Bankrate.com, renting a small P.O. box for six months costs as little as **$19** in some locations, while in other locations the cost is **$75**. The Cold Wire reports that PO Boxes start at **$4.33** a month and can run as high as over **$21.50** a month, with the average cost being around **$9** per month. You can find more information about how to reserve, rent, renew, and manage a PO Box online on the USPS website.
I hope this helps!