Granite is an unincorporated community with a U.S. Post Office in Chaffee County, Colorado, United States. The zip code of Granite is 81228. According to the 2010 census, the population is 116.Situated between the Mosquito and the Sawatch mountain ranges, Granite is ahigh mountain town located on the Arkansas River midway between Leadville to the north, and Buena Vista to the south.