The U.S. state that grows the most pumpkins is Illinois. 
It is estimated that about 12,000 acres of land is used in the state for growing pumpkins.  About 80 to 90 percent of those pumpkins are grown within 90 miles of Peoria, Illinois. A town near Peoria called Morton has deemed itself the "Pumpkin Capital of the World."
Morton is also famous for being the city where Libby's, a pumpkin processing company owned by Nestlé, is located. This company is well-known for its products like canned pumpkin pie mix and regular canned pumpkin. Libby's supposedly cans about 85 percent of the world's pumpkins.
Over 100,000 tons of pumpkins are processed and canned a year in the city of Morton alone.  This city is also the location of the famous Morton Pumpkin Festival.