The crossword solution for the term 'Montana Neighbor' is Wyoming, which is a 7-letter word. Wyoming is a state located in the western United States and is bordered by Montana to the north, South Dakota and Nebraska to the east, Colorado to the south, and Utah to the west. It is the 10th largest state in the US and is known for its mountains, prairies, and high desert. Wyoming is also home to Yellowstone National Park, the first national park in the world.