The two most popular types of onions in America are yellow onions and red onions. Sweet onions, such as Vidalia, and white onions are also common choices.
According to the National Onion Association, over 85 percent of the total U.S. onion production is yellow onions. Yellow onions range in size from small, golf-ball size to larger ones that are about the size of a softball. This is a versatile onion that often has thick layers and becomes sweeter the longer it is cooked.
Red onions are typically stronger than yellow onions and make up roughly 8 percent of the total U.S. onion production. This type features a bright color and is served raw in salsas and sandwiches.