18. The Midwest
Some states in the Midwest, such as the Dakotas, have boom and bust economies tied to oil. When oil prices are reasonable, the states become flush with cash, but when oil prices go down, the states have trouble raising enough revenue to fund public services. In South Dakota, those in the top one percent make upwards of $407,000 per year. In neighboring North Dakota, that number is about $445,000.
However, other Midwest states are much more stable and have similarly high thresholds as the Dakotas for those in the top one percent. In nearby Minnesota, the point is $443,000, and in Wyoming, the rate is closer to that of South Dakota at about $405,000.