This survey of 89 Colombian, Dominican, and Mexican organization leaders and additional interviews with community activists and government officials is part of a larger study of the organizations constructed by Latin American immigrants in the United States and their impact on the political incorporation of these immigrants to American society. This specific dataset was designed to give us greater understanding of the forces creating and sustaining these organizations and to test several preliminary hypotheses about the effects of contexts of exit and modes of incorporation in receiving countries on the character of immigrant transnationalism. Accordingly, there are detailed measures of the extent of economic, political, and socio-cultural transnationalism and characteristics of both the organizations and their members.