Jones Comity is located in eastern central Iowa, in the second tier of counties west of the Mississippi River. It is partly in the Mississippi loess soil area and partly in the Iowan drift soil area, hence the soils are of loessial and glacial origin. A large part of the county, almost one-half of the total area, is covered by loess soils.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 57—Jones County Soils" (1929). Soil Survey Reports. 63.