Jamestown is a Statutory Town located in Boulder County, Colorado, United States. The population was 205 at the 2000 census. It was named for James Smith, an early discoverer of gold.
Jamestown is located at 40°6′56″N 105°23′15″W / 40.11556°N 105.3875°W / 40.11556; -105.3875 (40.115485, -105.387531).
According to the United States Census Bureau, the town has a total area of 0.6 square miles (1.7 km²), all of it land.