. "This article is about a census-designated place in Rio Grande County, Colorado. For the ghost town of the same name in Chaffee County, please see Alpine, Colorado (ghost town).Alpine is a census-designated place located in Rio Grande County, Colorado, United States. ZIP code 81154 serves Alpine, but mail must be addressed to South Fork."@en . . . "-7" . . "-6" . "81154 (South Fork)" . "Alpine, Colorado"@en . "2526.0"^^ .