North Dakota with 9,051 millionaires.
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North Dakota
According to the 2013 wealth research study conducted by Phoenix Marketing International, the state of Delaware ranked ninth for the most millionaires in the US. Delaware has 21,679 millionaires living in its state.
Connecticut has the most millionaires per square mile in the United States. This is largely due to the proximity to Wall Street and several affluent suburbs.
Here is a great list of business and celebrity black millionaires. http://www.forbes.com/2009/05/06/richest-black-americans-busienss-billionaires-richest-black-americans.html
Honolulu has the most millionaires per capata
15,000
Fulton County, Georgia, which includes the city of Atlanta, has the highest concentration of black millionaires in the United States. This is due to the city's thriving business and entertainment industries, as well as a strong culture of entrepreneurship within the African American community.
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Perth has the highest number of self made millionaires in the world.
Yes. According to statistics from 2004, there were approximately 15,000 millionaires in Oregon, 0.4% of the state's population.