Seattle's port is the fourth largest in the United States. The six working piers owned by the port handle mostly containerized cargo, using 14 story tall cranes. A few major shipping companies dominate the trade in Seattle, including APL (American President Lines - which was treated to a totally remodeled Terminal 5 recently), and Cosco (Chinese Overseas Shipping Company). Cargo bound for Asia from the northeast often travels via container across the country on rail cars to Seattle, a day closer by water to Asian markets than LA/Long Beach (which manage twice the volume of the ports of Seattle/Tacoma). In fact, Seattle handles more of New York's Asian cargo than New York.
Port of Seattle