From
lawa.org
* U.S. Postal Service: Postal services are not available in any of the terminals at LAX. Travelers need to mail their correspondence before coming to the airport. The nearest U.S. Postal Service is located at 9029 Airport Blvd., Los Angeles, California 90009. Regular business hours are everyday from 7:00 a.m. to 11:00 p.m. For information, call 1-800-ASK-USPS.