Powderhorn is an unincorporated community and a U.S. Post Office in Gunnison County, Colorado, United States. The Powderhorn Post Office has the ZIP Code 81243. A post office called Powderhorn was established in 1880. Some say the community was named from a nearby landform in the shape of a powderhorn, while others believe an old powderhorn f…Powderhorn is an unincorporated community and a U.S. Post Office in Gunnison County, Colorado, United States. The Powderhorn Post Office has the ZIP Code 81243. A post office called Powderhorn was established in 1880. Some say the community was named from a nearby landform in the shape of a powderhorn, while others believe an old powderhorn found near the town site caused the name to be selected.
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