Cletus C. Coughlin and Thomas B. Mandelbaum contrast the two currently available state export series. The most prominent deficiency of both is that they are based on the value of export shipments from firms within a state rather than on the value of economic activity related to exports within a state. To address this deficiency, Coughlin and Mandelbaum develop a third measure of state manufactured exports. Comparisons between this and an existing measure of export activity illuminate the shortcomings of the two available series and the advantages of the new series.