Mountain States 2025

The Mountain States of the United States is one of the nine geographic divisions as designated by the U.S. Census Bureau. Additionally, it is a subregion of the Western states of the U.S. The term “Mountain States” is generally used to describe the states that are home to the Rocky Mountains. The total area of the Mountain States is over 855,000 square miles. The population of all states in this region based on 2018 estimates is over 25 million.

This region includes the following states: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, and Wyoming. Of the Mountain States, Arizona is the most populous with a population of over 7.17 million inhabitants. The next most populous state in this region is Colorado with a population of nearly 5.7 million. The least populous Mountain State is Wyoming, which has a population of just over 577,000. This is the only state in this region that has a population of less than 1 million.

The largest state by area is Montana, which has a total area of over 147,000 square miles. Montana is also the fourth largest state in the nation by area. New Mexico, Arizona, Nevada, Colorado, and Wyoming are also among the top 10 largest states by area in the U.S. The most populous city in the Mountain States is Phoenix, Arizona. Based on population estimates from 2014, Phoenix has over 1.5 million inhabitants. Arizona is also home to many of the region’s other largest cities, including Tucson, Mesa, Henderson, and Chandler. However, Phoenix is the only city in the entire region with a population that exceeds 1 million.

You can find many of the nation’s most beautiful natural landmarks in the Mountain States. This includes Arizona’s Bell Rock, Colorado’s Mesa Verde National Park and Great Sand Dunes National Park, and Idaho’s Shoshone Falls.