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Iowa is the number one state where corn comes/come from?

Please confirm that corn is uncountable, therefore, it should be comes.
Thanks
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Iowa is the number one corn-producing state.

More corn comes from Iowa than any other state.
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we have ears of corn, kernels of corn, stocks of corn, cans of corn, fields of corn; but corns are only on your feet.

It's uncountable like other grains, such as rice and wheat.

- A.
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Comments  
Thanks, GG and Avangi.
Is a cob an ear of corn minus the kennels?
Thanks
Students: Are you brave enough to let our tutors analyse your pronunciation?
Yes. They used to use them for making tobacco pipes, and for other ancient and honorable purposes.
Thanks Avangi.
One last question, I promise.
Why they? Should it be we (Americans)? Who are they?

Yes. They used to use them for making tobacco pipes, and for other ancient and honorable purposes.