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 (general store, post office, etc.) 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.
- U.S. Geological Survey Geographic Names Information System: Etna, Nebraska
- "Custer County". Jim Forte Postal History. Retrieved 25 August 2014.
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