Surprise is a city in Maricopa County, in the U.S. state of Arizona. The population was 30,848 at the 2000 census; however, rapid expansion has boosted the city's population to 117,517 at the 2010 census, an increase of 281%. As such, it is the second-fastest-expanding municipality in the greater Phoenix metropolitan area (after Gilbert) and, between 1990 and 2000, it was the sixth-fastest-expanding place among all cities and towns in Arizona.
The city has a 10,562-square-foot (981.2 m2) Aquatics Center and Maricopa County's northwest regional library, a $5.5 million, 20,000-square-foot (1,900 m2) library, along with a 100.3 cost of living index.
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