Tuba City is a census-designated place (CDP) in Coconino County, Arizona, United States. It is the second-largest community in Coconino County. The population was 8,611 at the 2010 census. It is the Navajo Nation's largest community, slightly larger than Shiprock, New Mexico, and the headquarters of the Western Navajo Agency. The Hopi town of Moenkopi lies directly to its southeast. The name of the town honors Tuuvi, a Hopi headman from Oraibi who converted to Mormonism.