3 Calif. Cities Atop Most Diverse Metros List

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The United States will be a "majority-minority nation" by 2042. In 2011, more than half of newborn children (under the age of one) were members of minority groups, according to theU.S. Census Bureau.

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But diversity in America varies substantially by geography.

A new study, titled "Racial and Ethnic Diversity Goes Local: Charting Change in American Communities Over Three Decades" (PDF), by sociologists Barrett Lee, John Iceland, andGregory Sharp of Pennsylvania State University, sheds light on these changing patterns, examining detailed data from the U.S. Census and American Community Survey from 1980 to 2010.

According to the study:

The chart below, from the study, plots the trend in diversity for metro, micro, and rural areas over the past three decades. Racial and ethnic diversity has increased across all three.Chart courtesy of “Racial and Ethnic Diversity Goes Local: Charting Change in American Communities Over Three Decades”

The study develops an index for racial and ethnic diversity to gauge "how uniformly members of a population are spread" across location. The index runs from 0 to 100, in which 0 signifies no racial and ethnic diversity and 100 indicates maximum racial and ethnic diversity, where "all groups represent equal proportions of the population."

Even though majority-white places remain the norm, the study states, "all-white" places have declined from about two-thirds in 1980 to one-third of all places by 2010. It finds that 97.8 percent of metros, 97.2 percent of micro areas, and 95.6 of rural areas experienced an "upward shift" in their diversity index over the past three decades.

The table below shows the ten most and least diverse metros in the U.S., according to the study.

Top 10 Metro Areas Ranked by Diversity, 2010

Table data courtesy of “Racial and Ethnic Diversity Goes Local: Charting Change in American Communities Over Three Decades”

Bottom 10 Metro Areas Ranked by Diversity, 2010

Table data courtesy of “Racial and Ethnic Diversity Goes Local: Charting Change in American Communities Over Three Decades”

Metros on the coasts tend to have higher levels of diversity, as the study notes. The Bay Area in particular stands out. Vallejo, California (northeast of San Francisco), has the highest level of diversity, followed closely by San Francisco. Nearby Stockton and San Jose also both make the top ten. On the East Coast, Washington, D.C. ranks fourth, while New York comes in fifth. Las Vegas, Houston, Los Angeles, and Honolulu also rank in the top ten.

Conversely, the least diverse are smaller metros in Texas, West Virginia, Ohio, Pennsylvania, Tennessee, Kentucky, New York, and Maine. The study notes that among these, most are majority white. Laredo, Texas, however, is 95.7 percent Hispanic, ranking it low in diversity.

The study also looks at the factors that are associated with ethnic and racial diversity across metros. It finds several factors to be positively associated with diversity, including: population size, the share of immigrants or foreign-born residents, a large stock of rental housing, a wide range of job options, and high levels of government or military employment.

The study also finds that the importance of coastal or border locations has declined somewhat over time, and notes that this is likely due to the broader migration of minority and immigrant groups across the U.S. in recent years.

Two factors appear to be negatively associated with diversity. The first is the ratio of minority-to-white incomes. The study's authors note that this result does not necessarily mean that members of minority groups are better off in homogeneous places, but rather reflects different patterns for Asian versus black residents. The second is the educational specialization of communities. Here, the researchers note that instead of being a pathway to greater opportunity, institutions of higher learning in college towns appear to "remain out of reach for many African Americans and Hispanics, with reduced diversity the consequence."

Overall the study is optimistic, concluding that:

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