Etna is a city in the Scott Valley area of Siskiyou County, California, United States. The population was 737 at the 2010 census, down from 781 at the 2000 census.
Etna is located at 41°27′26″N 122°53′49″W / 41.45722°N 122.89694°W / 41.45722; -122.89694 (41.457350, -122.896875). This is in Northern California near the Oregon border. Etna is located in Scott Valley next to the CPD of Greenview and the city of Fort Jones. Etna is located at the foot of the Marble Mountain Wilderness in the Siskiyou Mountain (Cascades) Range and is an attraction for hikers, rafters, climbers and people who do all sorts of other outdoor activities. According to the United States Census Bureau, the city has a total area of 0.8 square miles (2.0 km²), 99.88% of it land and 0.12% of it water.
The 2010 United States Census reported that Etna had a population of 737. The population density was 971.6 people per square mile (375.1/km²). The racial makeup of Etna was 627 (85.1%) White, 0 (0.0%) African American, 28 (3.8%) Native American, 1 (0.1%) Asian, 1 (0.1%) Pacific Islander, 6 (0.8%) from other races, and 74 (10.0%) from two or more races. Hispanic or Latino of any race were 26 persons (3.5%).