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Aliso Viejo is a city in the San Joaquin Hills of southern Orange County, California. It became Orange County's 34th city on July 1, 2001, the only city in Orange County to be incorporated since 2000. It is bordered by the cities of Laguna Beach on the west and southwest, Laguna Hills on the east, Laguna Niguel on the southeast, and Laguna Woods on the north.
The 2010 United States Census reported that Aliso Viejo had a population of 47,823. The population density was 6,400.4 people per square mile (2,471.2/km²). The population was spread out with 12,395 people (25.9%) under the age of 18, 3,739 people (7.8%) aged 18 to 24, 17,138 people (35.8%) aged 25 to 44, 12,003 people (25.1%) aged 45 to 64, and 2,548 people (5.3%) who were 65 years of age or older. The median age was 35.1 years. For every 100 females, there were 92.8 males. For every 100 females age 18 and over, there were 89.2 males.