One of the best sources for data on clusters is the U.S. Cluster Mapping website, a national initiative of the U.S. Economic Development Administration and Harvard Business School that provides open data on regional clusters and economies to support U.S. businesses, innovation, and policy. The website distinguishes between two types of clusters: traded clusters, groups of related indistries that serve markets beyond the region in which they are located; and local clusters, which consist of industries that serve local markets. Here we display the map of the traded food processing and manufacturing cluster.
For more information, see: http://www.clustermapping.us/