8 of the country's 15 fastest-growing cities are in Texas.

According to new population numbers from the U.S. Census Bureau, Texas's cities are expanding -- fast. The state houses eight of America's 15 fastest-growing cities. San Marcos, Texas, had the largest percentage increase, at 4.91 percent.

This map plots the top fast-growing large cities (any city or town with 50,000 people or more) between July 2011 and July 2012.

The release also charts the biggest cities in the country. There's not much change between 2010 and 2012 -- the top-10 cities remained the same, in the same rank-order. The remaining 15 cities on the list were also the biggest in 2010, but changed order — like Austin, which jumped from the 14th-biggest to the 11th-biggest.

The chart below compares the new population numbers for the 15 largest cities in the country as of July 1, 2012 to their population numbers from the 2010 Census.

The Census numbers also included increases from July 1, 2011 to July 1, 2012. New York City, unsurprisingly, had the largest actual increase, adding an additional 67,058 people. Houston, second on that list, added nearly half as many as New York, at 34,625.

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