County of Mason Real Estate View 72 listings HomeGuidesCounty of Mason Mason County is a county located on the Edwards Plateau in the U.S. state of Texas. At the 2010 census, its population was 4,012. Its county seat is Mason. The county is named for Fort Mason, which was located in the county. Guides County of AtascosaCounty of BanderaCounty of BexarCounty of BlancoCounty of BurnetCounty of CaldwellCounty of ComalCounty of EdwardsCounty of GillespieCounty of GonzalesCounty of GuadalupeCounty of HaysCounty of KarnesCounty of KendallCounty of KerrCounty of KimbleCounty of LlanoCounty of MasonCounty of MedinaCounty of RealCounty of UvaldeCounty of WilsonBandera / Pipe Creek / TarpleyBoerne / ComfortBulverde / Spring Branch / Canyon Lake / BlancoFredericksburgKerrvilleLa Vernia / FloresvilleMedina / MicoNew Braunfels / GruenePleasantonSan Antonio and the Metro AreasSeguin