Naco is a census-designated place located in Cochise County, Arizona, United States. Naco had a recorded population of 1,046 at the 2010 United States Census. Located directly across the United States–Mexico border from its sister city of Naco, Sonora, Naco is best known for an accidental 1929 air raid and is the first and only municipality in the Continental United States to have been aerially bombed by foreigners.