The county was formed from Bowie County in 1846. Jefferson was chosen as the first county seat, but, after several fiercely contested elections, in 1852 Linden became county seat. The county's boundaries were reduced in 1860 with the formation of Marion County, but, with the exception of small adjustments, have remained unchanged since that time. The county was originally named Cass County in honor of Lewis Cass, a United States Senator from Michigan who had favored the annexation of Texas. Linden, the county seat, is in the south central portion of the county fourteen miles southwest of Atlanta, the county's largest town. During the secession crisis Cass, who had formerly been known as a Northern man with Southern principles, resigned his post as secretary of state when President James Buchanan declined to defend the federal forts in Charleston, South Carolina. When word of his actions reached Texas, the name of the county was changed to Davis in honor of Jefferson Davis. The republican-controlled state legislature of 1871 changed the name back to Cass. -Handbook of Texas Online: Cass 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.