|Williamson County Texas Cities/Towns - Cedar Park, Florence, Georgetown (County Seat), Granger, Hutto, Jarrell, Leander, Round Rock, Taylor, Thrall
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Williamson County (sometimes abbreviated as "Wilco") is a county located in the U.S. state of Texas. In 2007 Census estimated it had grown to 373,363. Its county seat is Georgetown.
The county is named for Robert McAlpin Williamson, a leader and veteran of the Battle of San Jacinto.