Paul links to a report from TNS that lists the top 10 counties with millionaire residents. Harris county (which contains Houston) ranks #6:
Also interesting is that we have 16% of the Texas’s millionaire residences and that we’re above the only Bay Area county to show up on the list (Santa Clara County at #8, with about 25% fewer millionaires than Harris County). Now this could simply be about how county lines are drawn — Harris County is the third largest county in the contiguous 48 states.