Fast Facts
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Etna is a borough in Allegheny County, Pennsylvania, on the Allegheny River, opposite Pittsburgh. It flourished in the past when it was the site of rolling mills, furnaces, steel-mills, galvanized-pipe works, and other manufactures. In 1900, 5,384 people lived in Etna, in 1910. 5,830 lived there, and in 1940, 7,223 lived there. The population was 3,924 at the 2000 census.
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