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# Arizona Area Code 623
The 623 area code serves the western portions of the Phoenix metropolitan area in Arizona, including cities such as Glendale, Peoria, Surprise, and Avondale. Established in 2001 as an overlay to the existing 602 area code, the 623 code was created to accommodate the rapid population growth and increased demand for telephone numbers in the region. This area code covers a significant portion of Maricopa County and continues to serve both residential and business customers throughout the expanding western suburbs of Phoenix. The implementation of 623 reflected the region's economic development and the influx of new residents seeking opportunities in Arizona's growing metropolitan area.
The North American Numbering Plan (NANP) is the standardized system that designates and manages area codes like 623 across the United States, Canada, and several Caribbean nations. Under this system, the first digit of an area code cannot be 0 or 1, the second digit must be 0 or 1, and the third digit can be any number from 0 to 9. Area codes are assigned by the North American Numbering Plan Administrator (NANPA) based on geographic regions and telecommunications demand. When existing area codes become saturated with phone numbers, new codes like 623 are created through overlays or geographic splits to ensure an adequate supply of available numbers for growing regions, allowing the telecommunications infrastructure to support population expansion and economic development.