The historic Town of Jamestown is a Statutory Town in Boulder County, Colorado, United States. The population was 256 at the 2020 United States Census, down from 274 in 2010. It was named for James Smith, an early discoverer of gold. Jamestown was hit hard by the September 2013 Colorado floods when the town was isolated due to road damage from the rains and the flooding of James Creek. Under a mandatory evacuation order, most residents were airlifted to safety under the direction of the Colorado National Guard to nearby Boulder.

Boulder County is a county located in the U.S. state of Colorado of the United States. As of the 2020 census, the population was 330,758. The most populous municipality in the county and the county seat is Boulder.