Boone County is located in central Iowa almost in the center of the state. The location is shown on the accompanying sketch map. It lies entirely in the Wisconsin drift soil area and hence its soils are all of glacial origin. The total area of Boone county is 569 square miles or 364,160 acres. Of this area 343,709 acres, or 94.3 percent is in farm land. The total number of farms is 2,481 and the average size of the farms is 139 acres.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 34—Boone County Soils" (1924). Soil Survey Reports. 43.