New Jersey is a fairly diverse state. It's only 57 percent white, according to the most recent Census data. Among school-age children, white residents are now in the minority, although they still form the largest racial or ethnic group in the state ahead of Hispanic children.
But New Jersey is more diverse in sum than in the daily lives of its residents. The state is heavily segregated, with minority populations concentrated in more densely populated areas. One way to measure diversity is called the diversity index, which answers the question: If you picked two Jersey residents at random, what are the chances of them being of a different race?