To compile this list, 24/7 WallSt. assessed median household income in all US localities with at least 1,000 residents and fewer than 25,000 people. For the most part, the list remained areas with an average of 5,000 inhabitants. And the outlet also analyzed other variables provided by the Census Bureau data, such as the level of education. Here we present it: Crédito: PapaBear/Getty Images