Niwot is a census-designated place in Boulder County, Colorado, United States. It is a thirty-five mile drive northwest of Denver. The population was 4,006 at the 2010 census. The Niwot Post Office has the ZIP Code 80544.This locality is named for Arapaho Chief Niwot, a tribal leader in the Boulder area during the nineteenth century. The name means "left-handed". With a per capita income of $39,943, Niwot is ranked as the 17th wealthiest location in Colorado.Additionally, this locality is recognized for being the headquarters of footwear company, Crocs, Inc.