In this paper the authors present results of a series of experiments in which the input—output structure of the State of Washington (as reflected in 1972 survey-based input—output tables) is approximated from similar data for the nation (as given in the 1967 survey-based US tables). Variants of two kinds of nonsurvey approaches are employed. These are purely-nonsurvey methods (including, for example, adjustments according to simple location quotient measures) and partial-survey techniques (such as the RAS method). Comparisons between nonsurvey results and the Washington data are made on the basis both of regional coefficient matrices and of their Leontief inverses. Comparisons are also made with the results of several other studies that have utilized similar nonsurvey approaches. Certain procedures appear promising, especially when used in combination with survey estimates of regional value added and/or exports.