Is USPS Post Office Open On Sunday?

Just because there is no mail delivery on Sunday does not mean your local USPS Post Office is closed on Sunday. Many Post Offices are open on Sundays for PO boxes and basic package services in the lobby including a drop box for Priority and Express Mail packages, along with a self-service Kiosk and basic shipping supplies. The retail counter may not be open but with a self-service Kiosk you can get most of what you need done. Afterwards just drop the package or letter in the designated drop boxes.