Most Post Offices have 5 PO Box sizes, depending on availability*. Sizes range from extra small (XS – Size 1) to extra large (XL – Size 5). Choose your PO Box size based on the type of mail (letter-sized mail or packages) and how much mail and packages you receive.
If you get packages that don't fit into your PO Box, you'll either:
- Get a slip to pick them up from the counter during normal business hours
- Get your package from a secure parcel locker (including USPS® Smart Lockers at select locations) at your convenience
*Note: The depth of most PO Boxes is 14.75". All sizes not available in all locations. Prices differ depending on your location.