Richest households pass 1 million mark Report finds households with net worth of at least $5 million grew 23 percent to 1.14 million in 2006. By Jeanne Sahadi, CNNMoney.com senior writer April 17 2007: 9:32 AM EDT NEW YORK (CNNMoney.com) -- It's getting less and less lonely at the top. The number of U.S. households with a net worth of $5 million or more exceeded 1 million for the first time, according to a report released Tuesday. And that doesn't even include the value of their primary homes. The 1.14 million "ultra high net worth" households in 2006 is up from 930,000 in 2005 and is quadruple the 250,000 counted a decade ago, according to findings from "Affluent Market Insights 2007," compiled by the Spectrem Group, a consulting firm specializing in affluent and retirement markets. And those on their way to being ultra high net worth grew, too. Spectrem found that the number of U.S. households with a net worth of at least $1 million, excluding primary homes, grew to 9 million, up 8 percent from the year before, while households with at least $500,000 rose 9 percent to 15.3 million.