What States have a lot of farms and cornfields?

Usually the middle path of states in the USA produce a lot of corn -usually -starting from Texas up to North Dakota, ...with the center section of that path producing the most.  The other answers give great responses.

There are exceptions as most states have farmland of some type. In Oklahoma they have a lot of corn and wheat farmland,  but I found on the internet that a lot of corn is grown in the eastern parts of the USA also.

Nebraska. Kansas. Iowa.