This article explores the determinants of exports of the two coastal regions of the continental United States and the differences between them. The authors evaluate the contribution of international sociocultural and business networks to exports of the two major coastal regions of the United States, the West Coast and the East Coast, and examine their geographic trading affinities. The article finds that although transnational business ties play a significant positive role in boosting overall exports of both coasts, social networks of foreign-born immigrants play a similar role only for the West Coast. The study also suggests that the significance of distance as a proxy for transportation costs is somewhat diminished once these networks are taken into account. Both regions seem to share a propensity for exports to the Asia-Pacific region. (JEL R0, F10, F20)