9. Santa Clara, California: 2.9 percent
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This county of 1.7 million residents is home to Silicon Valley, known for fast-growing companies such as Apple (AAPL) and Google (GOOG). Technology will continue to fuel this county, but it also faces downsides, such as the high cost of housing.
"We do see demand for high-tech goods and services, so overall we are expecting economic output to be quite strong," Mowell said. "But in terms of the number of people continuing to move there, that's becoming increasingly difficult."
Over the next five years, the county's compound annual growth rate will be 2.9 percent, according to Oxford Economics.
