Fremont County is located in the southwestern corner of Iowa, being bounded by Nebraska on the west and Missouri on the south. It lies entirely in the Missouri loess soil area, and the soils are, therefore, practically all of loessial origin.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 58—Fremont County Soils" (1929). Soil Survey Reports. 62.