Instead of listing them, a billionaire per 1MM people stats would be more interesting. So which states have the most billionaires per capita? Well, a quick research:
https://en.wikipedia.org/wiki/List_of_U.S._states_by_the_number_of_billionaires
They have both the absolute numbers and the relative ones too. Absolute:
1. CA 189
2. NY 114
3. TX 60
4. FL 58
5. Il 17
Now per 10 MM:
1. WY 86
2. NY 58
3. CA 40
4. CT 39
5. MT 38

Can't imagine how the poorest billionaires in those states are feeling right now.