Post offices nationwide will be open Christmas Eve, Monday, and New Year's Eve, Monday, Dec. 31. Most post offices will shorten retail lobby hours and close at noon on these dates. Regular mail delivery will be unaffected by the change.

Revised hours will be posted at each post office, and commercial customers are asked to check their bulk mail entry units for specific information regarding holiday hours of operation.

Customers also may call (800) ASK-USPS for additional information. Post offices will be closed Dec. 25 and Jan. 1. Express Mail only will be delivered on Christmas Day and New Year's Day.