US Post Office-West Chester, also called the Robert J. Thompson Post Office Building, is a historic post office located in West Chester, Chester County, Pennsylvania.

It was constructed with Cockeysville Marble taken from a quarry near Avondale, Pennsylvania.

[2] Thirty years later, the post office was expanded with an addition to the rear of the building, increasing its size to 20,000 square feet (1,900 m2).

[1] In 2006, Congress passed Public Law 109-336, naming the building after Robert J. Thompson, a former Pennsylvania State Senator.

[3] In 2013, the West Chester post office was one of the buildings being considered for sale by the United States Postal Service, though as of 2023[update] it is still a functioning post office.