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• Village population size is often difficult to determine for prehistoric societies. • Multiple methods are used to estimate the number of storage pits and houses. • Multiple estimates of population size range from 100 - 180 inhabitants. • Converging multiple estimates provide a better estimate than any single one. • This approach is useful when traditional measures are not available. Prehistoric population sizes are difficult to determine, even with very well documented archaeological contexts. Within the Western Great Lakes, USA region, village population size is poorly understood due to poor preservation of village structures, excavations that did not capture the full extents of villages, and widespread destruction of archaeological sites. We combine data from geophysical surveys, historical aerial and drone-based image analyses, as well as excavation to determine the distribution of archaeological features at the protohistoric Middle Grant Creek site (11WI2739), Illinois, USA. Estimates of village population are calculated and compared using multiple measures, including structure floor area, maize storage volume, cultivation area, and maize consumption. The different estimates vary, yet they converge to indicate a population of 100 and 180 people at this agricultural village. The use of converging multiple estimates of population provides a more convincing estimate than any single source and shows how various assumptions affect different estimates. The measures employed provide a new approach to determining village size beyond traditional methods of using floor area and historic comparison, and can be used in locations where traditional measures are not available, as well as for large, dispersed sites that cannot be fully excavated. [ABSTRACT FROM AUTHOR]