The 1930s federal building is Texarkana's most photographed structure. State Line Avenue runs straight through it, and the address is split: the Texas side is 500 N. State Line, the Arkansas side is 500 N. State Line, but they fall under different jurisdictions. The exterior is solid limestone in a restrained Classical Revival idiom, with twin entrances mirroring each other across the state line.
Inside, the mail sorting room is bisected by a painted line on the floor. The courthouse upstairs still hears federal cases for both districts. Out front, the photo opportunity at the state line marker is obligatory: one foot in Texas, one in Arkansas, both in a postcard.