Mapping the Latino Population, By State, County and City
The nation’s Hispanic population, while still anchored in its traditional settlement areas, continues to disperse across the U.S., according to a Pew Research Center analysis of U.S. Census Bureau data.
Today, the 100 largest counties by Hispanic population contain 71% of all Hispanics. Los Angeles County, CA alone contains 4.9 million Hispanics, or 9% of the nation’s Hispanic population. But the share of all Hispanics who live in these same counties has fallen from 75% in 2000 and 78% in 1990 (Fry, 2008), reflecting Hispanic population growth outside of these 100 counties.
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http://www.pewhispanic.org/2013/08/29/mapping-the-latino-population-by-state-county-and-city/