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The COVID-19 pandemic induced numerous supply chain shocks in US agricultural markets though few empirical studies have sought to disentangle commodity price impacts caused by unique changes in food and non-food agricultural product demand. Using a data-modified version of the relative-price-of-a-substitute method, we distinguish the consequences of the sharp decline in US automotive fuel demand from the consequences of non-ethanol demand changes in the US corn market. Our results indicate that the onset of the COVID-19 pandemic reduced Illinois cash prices for corn by approximately 18%. The majority of this impact (approximately 16%) was driven by pandemic-induced ethanol demand reductions. Ethanol-driven and total impacts were greater in locations farther from terminal markets.