Westby, MT

ZIP code 59275 covers Nashua, a small town in northeastern Montana. The area is known for its sprawling grasslands, with the Milk River Valley running through it. One of the most notable landmarks in the area is the Fort Peck Dam, one of the largest earth-filled dams in the world, which created Fort Peck Lake. Outdoor enthusiasts flock to the area for fishing, boating, and hiking opportunities.