During the Republic of Texas, the area was part of Milam County. The Texas legislature established Williamson County on March 13, 1848, naming it for prominent judge and soldier Robert M. Williamson. Georgetown, the county seat, was laid out during the summer of that year. -Handbook of Texas Online: Williamson County

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This list contains or will contain all post offices known from Texas. Noted also are whether recent offices have had at least one precancel type, as listed in the Precancel Stamp Society's Town and Type Catalog of the United States and Territories, Sixth edition, Summer 1998, and from Fosters' personal knowledge. A link is provided to detailed precancel data for that location. The precancel device(s) may or may not still exist. An * indicates a discontinued post office or name change. Pester the active post offices so that devices can be retained or ordered. They may be found many times, but only have to be thrown away once. Precancel devices are not usually issued to branches, stations or contract post offices. Please see plans page for color legend.