Using Census data on race and ethnicity, Kolko and his colleagues "measured diversity as the share of a metro area's or ZIP code's population in its largest racial or ethnic group: the smaller the share of the largest group, the more diverse the neighborhood is." They found that among the 100 largest metropolitan areas in America, San Jose is ranked the most diverse, followed by New York, Oakland, Houston, Honolulu, Fort Lauderdale, Orange County, Memphis, San Francisco, and Alburquerque. The least-diverse parts of the country are identified as New England and parts of Pennsylvania, Ohio and West Virginia, as seen on this diversity map.
As defined by ZIP codes, the most diverse neighborhoods were determined to be Broadmoor Hills and Song in Irving, TX; followed by Queens Village in Queens, NY; San Francisco's Treasure Island; Lakemont in Houston, TX; Wahiawa in Honolulu, HI; Kahuku in Honolulu, HI; Rainier View in Seattle, WA; Dorchester in Boston, MA; Kapolei in Hononlulu, HI; and South Natomas in Sacramento, CA. Kolko noted that these areas "are not the densest, most central or best-known neighborhoods" and that "the most diverse neighborhoods in America are located in metro areas that aren't especially diverse overall, like Seattle (67% White) and Boston (69% White)."
Moreover, the most expensive neighborhoods are not diverse and consist of largely White populations including New York's West Village (83%) and Beverly Hills (83%). The "hipster" neighborhoods are a little more mixed, says Kolko, such as Brooklyn's Williamsburg, Chicago's Wicker Park, San Francisco's Mission District, and Los Angeles's Silver Lake. He also points out that non-White neighborhoods don't equate to diversity as seen in Chicago's Englewood and two of Washington D.C.'s Anacostia neighborhoods (95% black); Boyle Heights in Los Angeles and Miami's Hialeah (95% Hispanic); and Monterey Park in Los Angeles and Flushing in Queens (70% Asian).
Based on U.S. Postal Service data, Kolko compared population growth and home prices between diverse neighborhoods and other neighborhoods. He found that "[t]he more diverse neighborhoods have both higher population growth and stronger price growth in the past year - and they're a bit more expensive to begin with," concluding that "Americans, therefore, are moving toward diverse neighborhoods."
"However," he warns, "growth in those neighborhoods could affect their diversity: if prices in diverse neighborhoods rise, lower-income residents may get priced out over time."