Grand County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 15,717. The county seat is Hot Sulphur Springs.

The Town of Estes Park is a Statutory Town located in Larimer County, Colorado, United States. The town population was 5,904 at the 2020 United States Census. Estes Park is a part of the Fort Collins, CO Metropolitan Statistical Area and the Front Range Urban Corridor. A popular summer resort and the location of the headquarters for Rocky Mountain National Park, Estes Park lies along the Big Thompson River. Landmarks include The Stanley Hotel and The Baldpate Inn. The town overlooks Lake Estes and Olympus Dam.

Winter Park is a home rule municipality in Grand County, Colorado, United States. The permanent population was 999 at the 2010 census, although with 2,572 housing units within the town limits the seasonal population can be much higher. It is home to Winter Park Resort, a ski resort owned by Alterra Mountain Company. The town and resort are served by the Winter Park Express ski train run by Amtrak. The area also has cross-country skiing opportunities, including Devil's Thumb Ranch. In the spring and summer, Winter Park is known for mountain biking, concerts, hiking, and fishing.

The City of Boulder is a home rule municipality that is the county seat and most populous municipality of Boulder County, Colorado, United States. The city population was 108,250 at the 2020 United States Census, making it the 12th most populous city in Colorado. Boulder is the principal city of the Boulder, CO Metropolitan Statistical Area and an important part of the Front Range Urban Corridor. Boulder is located at the base of the foothills of the Rocky Mountains, at an elevation of 5,430 feet (1,655 m) above sea level. Boulder is 25 miles (40 km) northwest of the Colorado State Capitol in Denver. It is home of the main campus of the University of Colorado, the state's largest university.