Top 10 surprising states with the most millionaires

The number of U.S. households with at least $1 million in investable assets grew by more than 1.3 million since 2006, before the financial crisis, to 6.8 million households by mid-2016, accounting for 5.5 percent of all U.S. households, Phoenix Marketing International reported in February.

The overall wealth market is growing, but the ratio of millionaires to total U.S. households has remained relatively flat since 2006, and wealth is more concentrated and shifting geographically, according to the annual Phoenix Wealth & Affluent Monitor.