"The World in a Zip Code," finds that the Greater Washington region has become one of the top immigrant destinations in the country. Unlike many high-immigration regions, Greater Washington has both a remarkable diversity of newcomers and a wide dispersion of immigrants throughout the region, even in the far-flung suburbs.Of the top-ten zip codes of immigrant settlement, four each are located in Virginia and Maryland, while two are in the District of Columbia. The vast majority--87 percent--of the past decade's immigrants settled in the suburbs, with 46 percent moving to communities beyond the Washington Beltway.