Montgomery county is located in southwestern Iowa, in the second tier of counties north of the Missouri line and separated by only one county from the Nebraska state line on the west. It is entirely within the Missouri loess soil area and by far the largest percent of the soils are loessial in origin.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 13—Montgomery County" (1920). Soil Survey Reports. 21.