The U.S. state of Arizona is divided into three geographically distinct numbering plan areas (NPAs) which are identified by a total of five area codes, with one of the NPAs being configured as an overlay complex with two code.
602 was the original area code for Arizona, and was split in 1995 into 602, serving metropolitan Phoenix, and 520, serving the remainder of the state. In 1999, 602 was split into 480, 602, and 623, which were recombined in 2023. 520 was split in 2001 to form area code 928.
Area code Year Parent NPA Overlay Numbering plan area 602 1947 – 480/602/623 Phoenix metropolitan area 480 1999 602 480/602/623 Phoenix metropolitan area; After having been split from 602 in 1999, the three area codes were recombined in 2023 into an overlay complex. 623 1999 602 480/602/623 520 1995 602 – Southern Arizona, including Tucson and its metropolitan area, Casa Grande, Nogales, and Sierra Vista 928 2001 520 – Yuma, Kingman, Flagstaff, Prescott, the Arizona portion of the Navajo Nation, and Safford
See also List of North American Numbering Plan area codes
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