I have been using a PO Box for years. Even AMEX lets you put a PO Box for mailing address, but you have to have a physcial address due to Patriot Act. I have the actual cards sent to PO Box, no issue. I am lucky that my PO Box and physical address share the same zip code. I have found that if you have two address lines in the application, when I put the PO Box as the second line, then the Post Office always delivers the letter to the PO Box as default, even though there are two addresses on the letter, the key is same zip code. I have nothing ever come to my house, I have had to call CC and tell them that I travel for work and I can't have mail in my home mailbox as it is not secure, and that I have had mail stolen before as my home is right on the corner where middle school and high school kids catch the bus. if that helps..