America's a giant, rich place, but only one person can be the richest (Bill Gates - $76B); a more interesting question is "who is the richest person who can be (loosely) called my neighbor"? Well, if you live in Washington State, you're still competing with Bill "Almost Twelve Digits" Gates, but otherwise you may not even know who your wealthiest neighbor is. As they do every year, Forbes answered that question with their official list of the richest resident of every state.