Where can I find information on Customs port codes and districts?
A complete list of U.S. Customs and Border Protection port codes is maintained as the Schedule D, (U.S. Customs and Border Protection districts/ports, codes and descriptions) and is available from U.S. Census Bureau. The most recent Schedule D is available from the Census Bureau’s Foreign Trade Division at http://www.census.gov/foreign-trade/reference/codes/index.