where is mesa in co
Mesa, Colorado. Mesa is an unincorporated community and a U.S. Post Office located in Mesa County, Colorado, United States. The Mesa Post Office has the ZIP Code 81643. Mesa is located at 39Â°09â²59â³N 108Â°08â²20â³W / 39.16639Â°N 108.13889Â°W / 39.16639; -108.13889 (39.166271,-108.138943).