Etna is a town in the Scott Valley area of Siskiyou County, California, United States. Its population is 678 as of the 2020 census, down fro…Etna is a town in the Scott Valley area of Siskiyou County, California, United States. Its population is 678 as of the 2020 census, down from 737 from the 2010 census. Originally named Rough and Ready, it was changed by statute in 1874 to Etna after the local flour mill.
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