Wyoming

The latest census estimates put the population of Wyoming at 515,000-- in other words, less than the size of Irvine and Santa Ana put together. Imagine the inhabitants of these two cities alone spread out across all the California land from the Mexico border to San Francisco, and this will give you an accurate picture of Wyoming's density. Hemingway once said, "There are two places I love: Africa and Wyoming." If you've been, you can understand where he's coming from.