在办理入籍的过程中，我可能要离开美国3-4个月。
在NJ没有熟识的人帮忙收信，所以准备租一个PO Box。
-Yes, you can use a PO box as your mailing address, but be sure to also indicate your physical address where you reside in the proper place on the form.
请问USPS,USCIS改地址可以改成PO Box地址么？
-I really don't suggest you to change your mailing address during the case pending, especially not chnage it to Po Box. Don't take a risk to loss your USCIS mails.
