Round Rock is the nation's eighth-fastest growing city with a population of at least 100,000, according to a U.S. Census Bureau report detailing population estimates for 2009. The city's estimated population was 105,412 in 2009, up 3.4 percent from 2008. 

Round Rock was the second-fastest growing city in 2008. Since 2000, Round Rock has been the No. 7 fastest-growing city in the nation.

Four Texas cities ranked in the top 10 for population growth in 2009. Frisco was first, McKinney was third and Lewisville was tenth.

The new estimates are not 2010 Census population counts. They are, however, the last estimates to use 2000 Census results as a base.

In December, 2010 Census state population counts — used to apportion seats in the U.S. House of Representatives — will be delivered to the president. By April 1, 2011, the Census Bureau will release 2010 Census counts for counties, places and smaller geographic areas.

“Census numbers govern the distribution of more than $400 billion in federal funds each year and serve as the baseline for future post-census population estimates,” Census Bureau Director Robert Groves said. “Local governments use census data to plan new roads, schools and emergency services. Businesses use the data to develop new economic opportunities.”