The 10th largest state by area, it is also the least populous and least densely populated state in the contiguous United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the southwest, and Colorado to the south. The state population was estimated at 578,759 in 2019, which is less than 31 of the most populous U.S. cities, including Denver in neighboring Colorado. Cheyenne is the state capital and the most populous city, with an estimated population of 63,957 in 2018.

• Population: 576,851
• Area: 97,813 sq mi
• Capital: Cheyenne
• Largest City: Cheyenne
• Date of Admisson: Jul 10, 1890
• Number of Representatives: 1
• Number of Counties: 23

List of counties: