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 a high mountain town located on the Arkansas River midway between Leadville to the north, and Buena Vista to the south. It is in close proximity to the second and third highest peaks in the contiguous United States, Mount Elbert and Mount Massive.The town has a rich history from its days during the Pike's Peak Gold Rush, when it began as a mining camp and quickly boomed into a city of 3,000, holding the county seat. Early prospectors, such as Horace Tabor, were attracted to the area.