United States Post Office and Customs House, Government building in Fairlie-Poplar District, Downtown Atlanta, United States.

The United States Post Office and Customs House was a four-story federal structure occupying a full block between Marietta, Fairlie, Walton, and Forsyth streets. The building showcased late 1870s architectural styling with brick and stone construction, tall windows, and detailed brickwork typical of government buildings from that era.

The U.S. Post Office and Customs House opened in 1878 on Marietta Street, occupying the block bounded by Marietta, Fairlie, Walton and Forsyth streets in the Fairlie-Poplar district. In 1910 the City of Atlanta acquired the building and used it as Atlanta City Hall until 1930, when it was razed. The lot was rebuilt in 1958 as the Fulton National Bank building, now 55 Marietta Street.

This structure symbolized the expanding presence of federal authority in the region and served as an important place where ordinary citizens and merchants handled postal and customs matters. It was a gathering point for people from across Georgia who needed to conduct official business.

The building sat centrally in downtown Atlanta and was easily accessible on foot for anyone needing to handle postal or customs matters. Its downtown location meant that people from across the Georgia region could reach these services without undertaking lengthy travels.

The 1878 building served as Atlanta's City Hall from 1910 until 1930, when it was razed. The block bounded by Marietta, Fairlie, Walton and Forsyth streets was rebuilt in 1958 as the Fulton National Bank building, today the 55 Marietta Street building.