Courthouse in Port Huron, Michigan, is located on the south side of the Black River in the central business district.

[2] In 1872, Congress authorized construction of a building to house the U.S. Customs Service, a post office, and other federal agencies in Port Huron.

[2] In 1959–1960, the post office vacated the building and, at a cost of $250,000, the first floor was renovated to house the Social Security Administration.

The north and south elevations are highlighted by centered three-bay pavilions topped by pediments with dentil-block molding.

On the second and third stories, the pilasters rise to the base of the low-pitched roof and terminate in simplified Corinthian order capitals.

The original postal lobby, once stretching the length of the building along the north facade, was completely removed by 1959–1960 renovation work, but was restored in 2008 under the First Impressions Initiative of the U.S. General Services Administration (GSA).

The initiative uses historic building outlease funds to reclaim the architectural integrity of altered entrances and lobbies.

Utilizing historic photos, GSA recreated the original lobby volume, architectural details, and ornamentation, reestablishing the building as a community landmark.

The west elevation continues the rusticated pilasters and projecting belt course, but is terminated by a flat, stone parapet at the second-story level.