This bulletin reports findings of a survey of all known primary wood-using mills in Wisconsin in 2003. Detailed are the industry's size and composition, its use of roundwood, and its generation and disposition of wood residues. This information is necessary for informed planning and decisionmaking in wood procurement, forest resource management and utilization, forest industry development, and research. All volumes are reported in product-specific standard units and/or cubic feet. Volumes reported by mills in nonstandard units were converted to standard units using regional conversion factors. Reported trends and changes in the primary wood-using industry in Wisconsin are based on comparisons with previous surveys of the state's wood-using industry conducted in 990, 992, 994, 996, and 999. Small changes in quantities may appear for previous years compared to previously published data because of changes made to correct errors and omissions in previous surveys.