County named for Robert Anderson Irion. In 1874 the area became part of Tom Green County, which was formed that year from 12,500 square miles taken from Bexar County. In 1889 the Texas legislature formed Irion County from Tom Green County, and that same year the county was organized with Sherwood the county seat. The county seat was changed to Mertzon in 1936. -Handbook of Texas Online: Irion County |
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| NOTE: This list contains all current post offices plus any discontinued post offices known to 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. The precancel device(s) may or may not still exist. An * indicates a discontinued post office or name change. Links will be set up to individual precancel town pages when available. Pester these post offices so that devices can be retained or ordered. No post offices in Irion County were known to have used precancels. |
| Post Office | Zip / * | Established | first precancels Authorized | Discontinued | Notes |
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| BARNHART | 76930 | none | operating | ||
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| MERTZON | 76941 | none | operating | COUNTY SEAT, 303 W Oak Ave, 8:30-11:30, 12:30-3:30, Sat 8:30-9:30, (915)835-2941 | |
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