The United States Post Office and Courthouse, also known as Texarkana U.S. Post Office and Federal Building and as Texarkana U.S. Post Office and Courthouse, is located on State Line Avenue in Texarkana, straddling the border between Arkansas and Texas. It is a courthouse of the United States District Court for the Western District of Arkansas and the United States District Court for the Eastern District of Texas. The building was built in 1933 and was listed on the National Register of Historic Places in 2000.

The first courthouse built on this location was completed in 1892, serving as a courthouse until 1911, when it was succeeded by the erection of a separate courthouse entirely in Texas. The Texas-only courthouse later became the Texarkana Regional Arts Center. The earlier, border-straddling building continued to serve the Arkansas district alone until it was razed in 1930 to make way for the new construction, which was completed in 1933.

The Texarkana Post Office is unique as the only federal office that straddles state lines. The original post office building was constructed in 1892 and razed in 1930. The new building was finished in 1933 and featured a design that blended local materials from both states into the building. Engineers built the base of the building with granite from Texas while limestone from Arkansas formed the exterior walls. In a city where people from both states live and work on both sides of the state line, incorporating materials from both states into the building to represent the shared nature of the community this post office serves.

According to theclio.com; en.wikipedia. Source of photos: internet