Williamsport City Hall, formerly the United States Post Office, is a historic building located at 245 West 4th Street between Government Place and West Street in Williamsport, Pennsylvania.

It was built between 1888 and 1891, and is a 2 1/2 to 3-story building, with a two-story addition and six-story tower.

The exterior is faced with rough-faced gray limestone ashlar.

It was designed by the Office of the Supervising Architect under the direction of William A.

[2] The building was added to the National Register of Historic Places in 1972 as a post office.