Last week, I posted about the richest U.S. states, as measured by the number of ultrahigh net-worth residents. The post generated a number of requests for more-precise data, since the ultrarich list was really just a list of the largest states. Many also wanted incomes.
Right on cue come fresh data from the U.S. Census. The data, gathered from 2005 through 2009, show the top 10 counties as ranked by median income.