USPS gives you different choices for PO box sizes; your choice depends on the amount and type and size of the mail you receive.
2- Select PO Box Size:
|PO Box Size||Dimension|
|PO Box Size 1 (XS)||3” x 5.5” (holds up to 10 – 15 letters)|
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How big of a PO box do I need?
The size for the smallest box is 3 inches by 5.5 inches. This would be appropriate if you only need your PO Box to hold normal letters. For a slight step larger, they also offer the 5-by-5.5-inch size. This would be convenient if you expect larger letters or more mail.
What if a package is too big for my PO box?
If a piece of mail is too large to fit in your personal mailbox, a carrier can leave the package at your front door or in a lobby area. If a USPS carrier attempts to deliver a package and it won’t fit in the PO box, she will retain the package at a post office until you pick it up.
What forms of ID are needed to get a PO box?
A valid driver’s license or passport are two of the most common forms of valid photo ID to purchase a post office box. If you don’t have a driver’s license, you may opt for a state nondriver’s identification card, which you can apply for at your local Department of Motor Vehicles.
What is the cost of a post office box?
How to Rent a PO Box
|Box Size||3 Months||12 Months|
|X-Small (Size 1)||$22||$76|
|Small (Size 2)||$32||$112|
|Medium (Size 3)||$57||$198|