Bark Ranch is a census-designated place (CDP) in Boulder County, Colorado, United States. The population as of the 2010 Census was 213. It corresponds to the housing community of Bar-K Ranch.
Bar-K Ranch is located in west central Boulder County in the Front Range of the Colorado Rocky Mountains. It is situated on a ridge west of Jamestown and south of South St. Vrain Creek. Overland Road forms the northern edge of the community, leading east to Jamestown and Altona and west to State Highway 72, the Peak to Peak Highway.
According to the U.S. Census Bureau, the Bark Ranch CDP has a total area of 0.89 square miles (2.3 km2), of which 0.008 square miles (0.02 km2), or 1.09%, is water.