As you can see, a lot of these communities are around Silicon Valley and the New York City area without actually being located in cities. Atherton, California, the No. 1 spot, is located more or less between San Francisco and San Jose. More importantly, it's also near Palo Alto, Stanford University, and Menlo Park (aka the home of Facebook). The 6-square-mile community's average household income is a full $50,000 higher than the second-place city, Cherry Hills Village, Colorado.
Unsurprisingly, cities and towns in the tri-state area of Connecticut, New Jersey, and New York took 36 of the 100 spots, making it the most concentrated area of wealth in the country. What's more surprising is Highland Park, Texas's placement. The town is located in central Dallas Country and jumped from 14th place to ninth place in this year's survey, which Bloomberg attributes to "a zero state income tax and relatively low overall tax burden [making] it more attractive."