Foods that have high potassium levels include potatoes, tomato sauce, bananas, yellowfin tuna, white beans and blackstrap molasses. High-potassium foods have over 200 milligrams of potassium per serving; foods very high in potassium have over 300 milligrams per serving, according to WebMD.
The highest level sources of potassium are baked sweet potatoes at around 694 milligrams per potato, 1/4 cup of tomato paste at 664 milligrams and 1/2 cup cooked beet greens at 655 milligrams.
Plain, non-fat yogurt is the highest in potassium of all types of yogurt, with 579 milligrams per 8-ounce container. The same size serving of whole-milk yogurt has 352 milligrams, while low-fat, fruit-added whole-milk yogurt contains 443 milligrams.
Fruits rich in potassium include dried apricots, peaches, prunes and prune juice, orange juice, strawberries, and cantaloupe. Beets, broccoli, Brussels sprouts, carrots and spinach are high-potassium vegetables. Protein sources in this group include light-meat turkey, canned clams, rainbow trout, salmon, and cod. Others include lentils and kidney beans.
Fun foods that have high levels of potassium are french fries at 776 per 134-gram potato; fast-food chocolate milkshakes at 666 milligrams per 16-ounce shake; eggnog, with 417 milligrams per cup; and 1/2 cup of semi-sweet chocolate, which has 306 milligrams.