The Old Custom House is a historic government building in downtown Cairo, Illinois.

Built from 1869 to 1872, the building served as a customs house, post office, and courthouse.

When Cairo built a new post office in 1942, the building became the town's police station.

[2] The custom house was added to the National Register of Historic Places on July 24, 1973.

This article about a property in Alexander County, Illinois on the National Register of Historic Places is a stub.