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I tried to change my address today on https://moversguide.usps.com

In the address form, there is a field for PO Box. It is labeled "PO Box". One would assume you should type your PO Box number in this field, e.g. "1234". That is incorrect. You must enter the entire string "PO Box 1234". In a field that is already labeled "PO Box"

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I think that field can be used for other box purposes. "PO Boxes" are exclusively offered by the USPS, but there are private providers that provide a "PMB" mailbox, which depending on the situation may just a number. I think military post office may use that field as well.

It's been a long time since I've had to look at it, but there is a Postal Addressing Standards document that covers all of the various use cases. It actually gets pretty interesting when you need to get a letter delivered to a customer mailbox at a UPS store in an area with rural mail delivery.

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