Located in the Inland Empire just east of Los Angeles, the cities of Riverside, San Bernardino and Ontario are some of the fastest growing cities in the U.S., according to a report. The population in 2012 within those cities combined is an estimated 4,381,000, and it is expected to increase to 8,011,000 by 2042 --a 82.9 percent projected increase, which is the fourth highest in America.

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