The production of corn-based ethanol in the U.S. is dramatically increasing, and consequently so is the amount of coproduct materials generated from this processing sector. These streams are primarily utilized as livestock feed, which is a route that provides ethanol processors with a substantial revenue source and significantly increases the profitability of the production process. With the construction and operation of many new plants in recent years, these residuals do, however, have much potential for value-added processing and utilization in other sectors as well. Extensive research has been conducted into determining the nutritional properties of distillers dried grains with solubles (DDGS). Physical properties, however, have been largely ignored, but are needed for the proper design of processing operations and byproduct applications. Thus the objective of this research was to quantify physical property values for typical DDGS streams. Using standard laboratory methods, several physical properties were determined, including moisture content, water activity, thermal properties, bulk density, angle of repose, and color. The data generated during this study will be useful to both the ethanol and livestock industries, but further study is warranted in order to capture more fully the differences in physical properties between plants and over time, and also to develop rapid sensing techniques for the determination of these properties.