Fort Peck, MT

ZIP code 59223 encompasses the small town of Fort Peck, Montana. This area is best known for the massive Fort Peck Dam, which is one of the largest earth-filled dams in the world. The dam creates Fort Peck Lake, a popular spot for fishing and boating. The nearby Fort Peck Interpretive Center offers visitors a chance to learn about the history of the area and the construction of the dam.