Joe, bananas are loaded with potassium. Here's a list of other good sources of potassium:

Which Foods are High in Potassium?
Nutrition FAQ

By Shereen Jegtvig, MS

Updated December 20, 2013

Reviewed by a board-certified health professional. See About.com's Medical Review Board.
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potassium
hyperkalemia
basic nutrition
hypokalemia

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Bananas are a great source of potassium.
Ewa Walicka "Potatoes are good for your heart."

Potatoes are rich in potassium that is good for your heart.
Ewa Walicka
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potassium
hyperkalemia
basic nutrition
hypokalemia

Potassium is found in many different foods, especially fruits and vegetables, so you may be getting plenty of potassium in your diet right now. If not, here's a list of foods that contain potassium.

Foods High in Potassium

Raisins
Prunes
Potatoes
Apricots
Dates
Strawberries
Bananas
Watermelon
Cantaloupe
Citrus fruits
Beets
Greens
Spinach
Tomatoes
Mushrooms
Soy and soy foods
Many veggie burgers
Peas
Beans
Turkey
Beef
Salmon
Cod

A caveat: You can have too much potassium so don't over do it.