The Carl's Addition Historic District is a predominantly residential historic district in Siloam Springs, Arkansas. The area was developed between about 1895 and 1945, a period of growth brought about by the arrival of the railroad. It contains a concentration of Queen Anne and Craftsman style houses, although other popular revival styles are also represented to some degree. The district extends along South Wright Street between Twin Springs and Alpine Streets, and for single blocks along West Alpine and South College Streets.