I do P.O. Box, but I don't think there is a right or wrong way.
As an aside, YEARS AGO, the way to write "Washington, D.C." was like this, "Washington, D. C." There was a space between the "D" and the "C." I asked why and was told that it represented that the word "of" was missing, as in "District of Columbia."
This was during the days when the zip code was two digits. My address, for example, would have been Washington 15, D. C., and the phone numbers had words, like Kelloggs 5-5555.
Today, most people write "Washington DC," no period, no comma, and no space. I dropped the space, but I still use a comma and periods: "Washington, D.C."
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