What are some corn producing states?

Iowa has produced the largest corn crop of any state for each of the past 14 years. In an average year, Iowa produces more corn than most whole countries. For example, Iowa grows three times as much corn as a country like Argentina.

Sources: http://www.iowacorn.org/cms/en/CornEducation/FAQ/Faq.aspx & http://www.cattlenetwork.com/content.asp?contentid=310413