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Denio is a census-designated place (CDP) in Humboldt County, Nevada, along the Oregon state line in the United States. The Denio post office was originally north of the state line in Harney County, Oregon, but the residents moved the building into Nevada in the mid-20th century. The population of the CDP, which is entirely in Nevada, was 34 at the 2020 census. Additional development considered to be Denio extends into Oregon. The CDP includes a post office, a community center, a library, and the Diamond Inn Bar, the center of the town's social life. Recreational activities in the Denio area include bird watching, photography, off-road vehicle use, fishing, recreational black opal mining, rockhounding, hunting, visiting the hot springs, and camping on the Sheldon National Wildlife Refuge.