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.

Maricopa County, Arizona
Maricopa County, Arizona
Population: 3,768,123

Increase (July 2005 - July 2006): 129,642

Maricopa added more residents to its population in the 12 months ended July 1, 2006, than live in the city of Savannah, Georgia.

Its main city, Phoenix, has grown from a modest desert town into the sixth-largest city in the nation.

Growth for the county as a whole has been explosive, from less than a million in 1970 to 3.8 million today. The population has increased by about 700,000 since 2000.

Helping to drive growth is a diversified economy; many high-tech and telecoms companies have relocated to the area in the past few decades. And the climate attracts many seasonal visitors, adding to a strong tourism industry.

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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