Vail is a census-designated place (CDP) in Pima County, Arizona, United States. It is 24 miles (39 km) southeast of Tucson. The population was 10,208 at the 2010 census, up from 2484 in the 2000 census. The area is known for the nearby Colossal Cave, a large cave system, and the Rincon Mountains District of Saguaro National Park, a top tourism spot within Arizona.

Pima County is a county in the south central region of the U.S. state of Arizona. As of the 2020 census, the population was 1,043,433, making it Arizona's second-most populous county. The county seat is Tucson, where most of the population is centered. The county is named after the Pima Native Americans, also known as Tohono O'odham, who are indigenous to this area.