Here is a list of some high-potassium foods, courtesy of the Linus Pauling Institute: Potato, baked with skin, 1 medium, 926 mg Plums, dried (prunes), 1/2 cup, 637 mg Prune juice, 6 fluid ounces, 528 mg Spinach, cooked, 1/2 cup, 420 mg Banana, 1 medium, 400 mg Orange juice, 6 fluid ounces, 372 mg Tomato, 1 medium, 292 mg Sunflower seeds, 1 ounce, 241 mg Almonds, 1 ounce, 200 mg