The boom areas of America

10 fastest-growing U.S. counties

According to the Census Bureau, these counties are adding more residents than any other.

Clark County, Nevada
Clark County, Nevada
Population: 1,777,539

Increase (July 2005 - July 2006): 68,175

In the 1950 census, the total number of Nevada residents just topped 160,000; it was the smallest state in the union.

Now the population of Clark County alone increases by more than that every three years.

The reason: Gaming. The county's main city, Las Vegas, is the heart of the nation's increasingly rabid gambling culture.

Maricopa County, Arizona

Harris County, Texas

Riverside County, California

Clark County, Nevada

Tarrant County, Texas

Bexar County, Texas

Collin County, Texas

Dallas County, Texas

Wake County, North Carolina

San Bernardino County, California
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