| Williamson County Texas Cities/Towns - Cedar Park, Florence, Georgetown (County Seat), Granger, Hutto, Jarrell, Leander, Round Rock, Taylor, Thrall |
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![]() Your Ad Here 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. History The county is named for Robert McAlpin Williamson, a leader and veteran of the Battle of San Jacinto. |