Since World War II, census data show that the number of Iowa farms and farm operators has dropped 1,600 to 1,700 per year- depending on what is called a "farm." The resulting consolidation of smaller units into larger ones is one of the major adjustment trends taking place in Corn Belt agriculture.
Brown, Dean and Beneke, Raymond R.
"Farm Consolidation in Iowa,"
Iowa Farm Science: Vol. 12
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss11/2