Harvested wood products (HWPs) result in the transfer of carbon from live trees into long-term storage of products in use and solid waste disposal sites (SWDS). We provide an improved framework for estimating the carbon in HWPs in use and in SWDS through the integration of both plot-level nationwide forest inventory (NFI) data and county-level timber product output (TPO) survey statistics. Our methodology more closely aligns estimates of carbon in HWPs and in forest ecosystem pools, specifically the amount of carbon in harvested trees on NFI plots. This improved framework also allows for the disaggregation of national estimates to the state and entity level. Estimates are compiled in the United States Forest Service WOODCARB model which uses data from NFI and TPO as inputs, and allows for the integration of more specific, localized data to increase precision and reduce uncertainty in estimates.