Etna is an unincorporated community in Custer County, Nebraska, United States. It lies at an elevation of 2,802 feet. A post office was established at Etna in 1885, and remained in operation until it was discontinued in 1921. Etna no longer exists, a simple roadside marker indicates the location of the former town. The school survived until 1966, but most other estab…Etna is an unincorporated community in Custer County, Nebraska, United States. It lies at an elevation of 2,802 feet. A post office was established at Etna in 1885, and remained in operation until it was discontinued in 1921. Etna no longer exists, a simple roadside marker indicates the location of the former town. The school survived until 1966, but most other establishments closed in 1931. There is a mailbox next to the marker with a book of historical information about Etna and a guest book to sign.
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