The single highest-potassium common whole food per typical serving is the baked potato with skin : a large baked potato can provide around 1,600 mg of potassium, which is roughly one‑third of the daily recommended intake for adults.

Top high‑potassium foods

Here are some of the richest everyday foods in potassium per typical serving:

  • Baked white potato with skin (large, ~300 g): about 1,600 mg.
  • Baked sweet potato (large, ~235 g): about 1,100 mg.
  • Cooked spinach (1 cup): around 800–840 mg.
  • Cooked soybeans (1 cup): nearly 890 mg.
  • White beans and other legumes (1 cup cooked): often over 700 mg.
  • Avocado (1 cup, cubed): about 700+ mg.

For most people, these foods make it easy to boost potassium intake while also adding fiber, vitamins, and other minerals.

Simple takeaways

  • If you want the single highest common food per serving, choose a large baked potato with the skin on.
  • To spread potassium through the day, mix foods like potatoes, leafy greens, beans, soy, and avocado into meals.
  • If you have kidney disease or take medications that affect potassium, always check with a healthcare professional before deliberately increasing high‑potassium foods.

TL;DR: The champion food for potassium per typical serving is a large baked potato with its skin, followed closely by sweet potatoes, cooked spinach, soybeans, and other beans.

Information gathered from public forums or data available on the internet and portrayed here.