Agate is an unincorporated community and U.S. Post Office in Elbert County, Colorado, United States. The ZIP Code of the Agate Post Office is 80101. The town of Gebhard was established by the Union Pacific Railroad about 1876. The Gebhard post office opened on April 8, 1881. The name of the town was changed to Agate on April 24, 1882. Altho…Agate is an unincorporated community and U.S. Post Office in Elbert County, Colorado, United States. The ZIP Code of the Agate Post Office is 80101. The town of Gebhard was established by the Union Pacific Railroad about 1876. The Gebhard post office opened on April 8, 1881. The name of the town was changed to Agate on April 24, 1882. Although "Gebhard" was established by the UPRR, the town of Agate existed, by that name, as a locality used by local ranchers prior to the construction of the railroad. The town's name most probably comes from an "A-gate" – a wooden gate with an A-shaped cross-brace, but is sometimes claimed to be named for agate found in the area. The northeasternmost community in Elbert County, Agate is a ranching community and the home of Agate School District 300, one of the smallest school districts in Colorado.
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