It's been almost a decade since Time magazine declared Sacramento as the nation's most diverse city. And it's only gotten more diverse since then, according to a Bee review of the latest census data. Pick two people at random from the city and there's an 80 percent chance that they will be from different ethnic groups.
Many of the region's suburbs, though, remain homogeneous. Pick two people at random from Loomis, Cameron Park or Granite Bay, and there's just a 30 percent chance that they will be from different ethnic groups.
This map is color-coded to show the zip codes with the highest and lowest likelihood that two random residents will be from different ethnic groups. Click on a zip code to see its ethnic breakdown.
The "diversity index" measures the likelihood that two residents chosen at random will be from different ethnic groups , based on a formula created by University of North Carolina professor Philip Meyer and USA Today journalists Shawn McIntosh and Paul Overberg.
Original Time magazine article here. While labeled "Welcome to America's Most Diverse City," the article is more about how Sacramento is the most integrated city in America; in other words, members of different ethnic groups here tend to live close to one another. An area can be integrated but not very diverse -- Salt Lake City, for example.
Source: Census 2010