Crawford County is located in western Iowa in the second tier of counties east of the Missouri River and in the middle tier between the north and south state boundaries. It lies entirely in the Missouri loess soil area and the soils of the county are, therefore, chiefly of loessial origin.
Brown, P. E.; Benton, T. H.; and Meldrum, H. R., "Soil Survey of Iowa, Report No. 73—Crawford County Soils" (1935). Soil Survey Reports. 79.