It was demarked from Fannin County on April 3, 1846, and named for Collin McKinney, one of the first settlers of the county and a signer of the Texas Declaration of Independence. It was organized 7/13/1846 with the original county seat at Buckner. Because this town Buckner was not within three miles of the center of the county, however, McKinney became the county seat in 1848. Like the county, McKinney was named for Collin McKinney. -Handbook of Texas Online: Collin 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.