Enlarge By LM Otero, Associated Press EDS is based in the USA's most affluent city, Plano, Texas. What's the most affluent city in the USA? (a) San Jose (b) San Francisco (c) Honolulu (d) Plano, Texas The answer is Plano — and that surprises even the mayor of this 260,000-person Dallas suburb. "I'd never heard that before," Plano Mayor Pat Evans says. "But it's good to know." The Census Bureau released its annual report on income and poverty Tuesday. The results offer an interesting — and often unexpected — portrait of who's rich and who's poor in the USA. Plano was the report's star among cities with populations of 250,000 or more. It had the highest income and lowest poverty rate. Plano's median household income in 2007 was $84,492, up 10% from 2006. Placing a distant second: San Jose, with a median income of $76,963. CENSUS: Uninsured total shrank, incomes rose in 2007 EXPERTS: Economy may stall push for health care Plano is the home to corporate headquarters for Frito-Lay, JCPenney and other companies. Billionaire Ross Perot founded computer giant EDS and Perot Systems, both still based in Plano. The city is north of Dallas at the end of a light-rail line. Gymnast Nastia Liukin, Olympic gold medalist in Beijing, trains there. Despite its affluence, the median home price is about $225,000, Evans says. By contrast, San Jose's median home price is $744,000. "We've got the lowest taxes and highest level of services in North Texas," the mayor says. The poorest city in the nation was Detroit, with a median household income of $28,097. It fell to the bottom spot this year, replacing Cleveland. The Census Bureau report also showed: •States. Maryland remained the top state in income, and Mississippi remained the poorest. Energy states Alaska and Wyoming had the biggest income gains. Four states lost ground: Michigan, Kentucky, New Mexico and South Dakota. •Congressional districts. Rep. Tom Davis, R-Va., who represents suburbs outside Washington, has the most affluent constituents. Their median household income was $103,664. Rep. José Serrano, D-N.Y., who represents Harlem and the Bronx in New York City, has the district with the poorest residents. Median household income was $23,291. •Regions. Income grew in the South and Midwest. It fell in the Northeast and did not change in the West. Guidelines: You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. Read more