Woodbury County is located in western Iowa, being separated by the Missouri and Big Sioux Rivers from Nebraska and South Dakota on the west and it is in the fourth tier of counties south of the Minnesota state line. It lies entirely in the Missouri loess soil area and hence the soils of the county are mainly of loessial origin.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 40—Woodbury County" (1926). Soil Survey Reports. 37.