I work for a Las Vegas newspaper and we have the income quintiles for Clark County, Nevada (American Community Survey, 5-year estimate, 2009-2013) based on aggregate income of a household.
3.75% bottom fifth
9.50% lower middle
23.07% upper middle
48.42% top fifth
B19082 Shares of aggregate household income by quintile
Is there a way to get the actual dollar figures?