Main city: Surprise
Timezone: (UTC-7)
Phone type: Landline
Operator: Qwest Corporation

Surprise, a city in Maricopa County, Arizona, USA. The population was 30,848 at the 2000 census; however, rapid growth has boosted the city's population to 117,517 at the 2010 census, an increase of 281%. As such, it is the second fastest-growing municipality in the greater Phoenix metropolitan area (after Gilbert) and, between 1990 and 2000, it was the sixth fastest-growing place among all cities and towns in Arizona. ^source

North American area code 623 is a state of Arizona telephone area code which was created in a split from area code 602 on April 1, 1999, when it was deemed that the Greater Phoenix metropolitan area could no longer continue with just one area code due to its explosive growth in the 1990s. The west side and the western half of the far north side became 623, while the eastern suburbs and the Phoenix neighborhood of Ahwatukee became area code 480. Generally, 623 is coextensive with the West Valley area. ^source