P.O. Box In Address

I am inviting several guests to my wedding who`s addresses contain P.O. Boxes. Should I use the abbrieviation on the addresses, or should I spell out "Post Office Box"? I can`t find any info anywhere on the proper etiquet for this! Please help!
Posted by Jessica; updated 03/18/04

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I would spell it out.
Posted by Liza; updated 04/12/04

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I have never seen it spelled out. I have a po box and would hate if somebody had to sit and write all that out. I think as long as the names are written out in full and regular address, than abb. PO should be ok.
Posted by Brandy; updated 04/15/04