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在辦理入籍的過程中，我可能要離開美國3-4個月。
在NJ沒有熟識的人幫忙收信，所以準備租一個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.

請問USPS,USCIS改地址可以改成PO Box地址麽？

-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.