This study documents the fertilizer operations of regional and interregional cooperatives in the United States. The findings provide 1984 data on sales, market share, production, capacity, inputs, and markets for the largest regional and interregional cooperatives involved in the fertilizer industry. Twenty-four cooperatives provided data for this report, based on their fiscal years ending during calendar year 1984. Participating cooperatives, including two interregionals and twenty-two regionals, represent the vast majority of fertilizer products flowing through the cooperative system at the manufacturing and wholesaling level. Data from earlier studies and secondary data from various public sources form the basis for analysis of trends between 1970 and 1984.