Austin recently beat out San Francisco for the number 13 spot on the list of the largest cities in the US. The 2011 census cites a growth rate of close to 4% from the previous year with the population growing from 790,390 in 2010 to 820,611 in mid 2011.
http://www.bizjournals.com/austin/blog/morning_call/2012/07/austin-moves-up-one-spot-on-largest.html#comments