Yes, popcorn does contain a small amount of iron. A 3-cup serving of plain, air-popped popcorn contains about 0.7 mg of iron. To put it in perspective, the recommended daily intake is 18mg for women of reproductive age and 8mg for men and women over the age of 50. Therefore, while popcorn does contain iron, it should not be relied upon as a primary source of this nutrient.