Fastest-growing city in West Virginia: Martinsburg

Number of households: 13,215
Pct. Chg: +4% since 2008 (+23% since 2000)
Average household income: $49,629 (+26% since 2000)
Why: The IRS has a facility in this town in eastern West Virginia where it processes most of the country's electronically filed tax documents. In addition to government employers, companies such as General Motors and FedEx are also here.

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