It may make sense that areas rich in hedge funds and high tech might have the highest percentage of residents among the top 5% on the income scale, but Trenton, N.J.? Baltimore? Oxnard, Calif.? All three of those rank among the 20 metropolitan areas nationwide with the biggest share of high-income households, according to the Census Bureau. For 2006–11, households in that group received at least $191,469 per year. All of the top 20 had rates at least seven times larger than the markets with the lowest share of high-income homes.