Yes, of course they are. Potatoes by themselves contain no fat or cholesterol. The average size potato contains only about 100 calories and it is about 80 percent water. Potatoes contain 45 percent of your daily recommended vitamin C and 21 percent of your daily Potassium. Potatoes also contain vitamin B6, fiber, and antioxidants (which have shown to reduce the risk of cancer). The skin of the potato is where you can find most of the fiber, with many nutrients located close to the skin.
Source: National Potato Council
For more info, explore our Nutrition page!