Hydrogen production is critical both for energy transition ambitions and for the existing petrochemical industry. This study evaluates county-level biohydrogen production potential across the contiguous United States (U.S.) by integrating biomass resource availability from the Billion-Ton 2023 (BT23) study with location data on natural gas pipeline infrastructure and refinery hydrogen demand. A multi-criteria decision analysis (MCDA) framework is applied using weighted factors for biomass produc