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I am not aware of any specific resource for locating P.O. Box numbers. Your best bet might be to see if the public library in that city has digitized any of the local newspapers from that time period. If so, you could do a keyword search for the P.O. Box number (or maybe just for “photography” or “photographer”) and see if you get lucky and find an advertisement for that photographer that includes their P.O. Box number. It’s probably a long shot, but it might be worth a try.
Another option would be to get in contact with the U.S. Postal Service historian’s office and see if they have any other suggestions for resources. They can be contacted at firstname.lastname@example.org.
Hi Andrew, thank you for the reply. I have found business directories for that time period and city, which list a number of photographers. I'll try the resources you suggested in an attempt to identify the PO box owner. thank you, joan