what county is nogales az in
Nogales, AZ. Online Offers. Nogales is a city in Santa Cruz County, Arizona, United States. The population was 21,017 at the 2010 census. According to 2005 Census Bureau estimates, the population of the city is 20,833. The city is the county seat of Santa Cruz County. Nogales, Arizona, borders the city of Nogales, Sonora, Mexico, and is Arizona's largest international border town.