The U.S. Post Office in Elyria, Ohio, located at 345 Broad Street, is a monumental example of Classical Revival civic architecture. Completed in 1916 under the direction of the Office of the Supervising Architect under James A. Wetmore, the building was designed to serve as a prominent anchor for Elyria's downtown commercial district. The structure features a grand, symmetrical limestone facade characterized by a raised basement, monumental engaged columns, and a refined dentiled cornice. Its design reflects the federal government's standardized efforts in the early twentieth century to project strength, permanence, and democratic ideals through classical design principles. The building was formally listed on the National Register of Historic Places in 1982.

Historically, the post office is significant for its association with the growth and development of Elyria as a major industrial and administrative hub in Lorain County during the early twentieth century. As the city's population and manufacturing sectors swelled, the construction of this grand federal facility was authorized to handle the increased volume of mail and to house local federal offices, symbolizing Elyria's rising economic importance. Architecturally, it stands as one of the finest surviving examples of institutional Classical Revival design in the county, showcasing the high-quality craftsmanship and materials characteristic of the federal Treasury Department's golden age of construction. It remains a vital visual landmark and a testament to the civic pride and federal investment of its era.