U.S. Post Office, now known as Williamsport City Hall, is a historic city hall

Seat of local government

In local government, a city hall, town hall or a municipal building or civic centre, is the chief administrative building of a city...

 located at Williamsport

Williamsport, Pennsylvania

Williamsport is a city in and the county seat of Lycoming County, Pennsylvania in the United States. In 2009, the population was estimated at 29,304...

, Lycoming County, Pennsylvania

Lycoming County, Pennsylvania

-Appalachian Mountains and Allegheny Plateau:Lycoming County is divided between the Appalachian Mountains in the south, the dissected Allegheny Plateau in the north and east, and the valley of the West Branch Susquehanna River between these.-West Branch Susquehanna River:The West Branch of the...

. It was built between 1888 and 1891, and is a 2 1/2 to 3-story building, with a 2-story addition and 6-story tower. The exterior is faced with rough-faced gray limestone

Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....

 ashlar

Ashlar

Ashlar is prepared stone work of any type of stone. Masonry using such stones laid in parallel courses is known as ashlar masonry, whereas masonry using irregularly shaped stones is known as rubble masonry. Ashlar blocks are rectangular cuboid blocks that are masonry sculpted to have square edges...

. It was designed by the Office of the Supervising Architect

Office of the Supervising Architect

The Office of the Supervising Architect was an agency of the United States Treasury Department that designed federal government buildings from 1852 to 1939....

 under the direction of William A. Freret

William A. Freret

William Alfred Freret was an American architect. He served from 1887 to 1888 as head of the Office of the Supervising Architect, which oversaw construction of Federal buildings....

 (1833–1911).

It was added to the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

in 1972.