Hancock County is located in north central Iowa in the second tier of counties south of the Minnesota state line and in the middle tier of counties from east to west in the state. It lies entirely in the Wisconsin drift soil area, and hence its soils are all of drift or glacial origin.
Brown, P. E.; Meldrum, H. R.; Benton, T. H.; and Killinger, G. B., "Soil Survey of Iowa, Report No. 76—Hancock County Soils" (1935). Soil Survey Reports. 76.