The iodine content of diets of typical American infants, toddlers, and adults in recent years was found to be far in excess of the amount necessary for adequate nutrition. Dairy products were the major contributor. Other large contributors were grain and cereal products, sugars and adjuncts, and meat, fish, and poultry in adult diets and grain and cereal products and meat, fish, and poultry in infant and toddler diets. A statistical evaluation of the data and a discussion of possible sources of iodine are presented.