Castle Rock is located in the state of Colorado and a city and seat of Douglas County and is considered an affluent home rule municipality and was considered to be the most populous community in the county. The name of the city was taken after the prominent castle tower-shaped butte that is nearby the center of town. Castle Rock is situated midway between Denver and Colorado Springs. The town was home to the Arapaho and Cheyenne people who were the original inhabitants of the area before the settlers arrived on the site. The tribes occupied the land that is in between the rivers of Arkansas and South Platte. The settlement started to grow upon the discovery of the rhyolite stone, and not gold, that will ultimately lead to its colony.