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15. Port of Charleston, S.C.

Type: Water Gateway
Imports: $30.8 billion
Exports: $19.4 billion

This port is a major gateway for imports from South America and exports to Europe. In 2007, Brazil was the largest import market, and Germany the major destination for exports.

Major items imported and exported include, grain, steel and iron ore. In 2008, Charleston’s port handled more than 1.3 million containers, accounting for about 5 percent of total U.S. containerized freight.

Source: bts.gov

Photo: Ariana Lindquist | Bloomberg | Getty Images