Castle Pines is a former census-designated place (CDP) in Douglas County, Colorado, United States. The population was 3,614 at the 2010 census. On November 6, 2007, the northern portion of the Castle Pines CDP was incorporated as the City of Castle Pines North and the southern portion remained as Castle Pines. On November 2, 2010 the City of Castle Pines North rename themselves to the City of Castle Pines and the Castle Pines CDP was renamed to Castle Pines Village as a result.