Here are the 2009 population estimates for Austin and surrounding communities:
Travis County Population
Austin 749,861
Pflugerville 33,862
Lakeway 9,966
Lago Vista 6,358
West Lake Hills 3,169
The Hills 3,093
Manor 2,648
Jonestown 2,094
Rollingwood 1,312
Briarcliff 1,108
Mustang Ridge 964
Bee Cave 946
San Leanna 693
Sunset Valley 451
Creedmoor 268
Williamson County Population
Round Rock 93,551
Cedar Park 53,210
Georgetown 41,310
Leander 19,725
Taylor 15,428
Hutto 9,671
Liberty Hill 1,620
Granger 1,192
Florence 878
Thrall 668
Weir 520
Hays County Population
San Marcos 46,446
Kyle 20,779
Buda 3,460
Dripping Springs 1,772
Woodcreek 1,443
Mountain City 1,289
Uhland 1,246
Niederwald 667
Hays 276
Bear Creek 380
Bastrop County PopulationElgin 10,258
Bastrop 7,299
Camp Swift 5,598
Smithville 4,611
Caldwell County PopulationLockhart 13,531
Luling 5,399
Martindale 1,022
Source: Nielsen Claritas