Etna is a census-designated place (CDP) in Lincoln County, Wyoming, United States. The population was 123 at the 2000 census.
In the CDP the population was spread out with 34.1% under the age of 18, 4.1% from 18 to 24, 29.3% from 25 to 44, 19.5% from 45 to 64, and 13.0% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 89.2 males. For every 100 females age 18 and over, there were 84.1 males.
The median income for a household in the CDP was $42,917, and the median income for a family was $44,375. Males had a median income of $41,667 versus $0 for females. The per capita income for the CDP was $17,423. There were 19.4% of families and 24.5% of the population living below the poverty line, including 17.1% of under eighteens and 48.1% of those over 64.
As of the census of 2000, there were 123 people, 44 households, and 34 families residing in the CDP. The population density was 62.8 people per square mile (24.2/km²). There were 55 housing units at an average density of 28.1/sq mi (10.8/km²). The racial makeup of the CDP was 93.50% White, 1.63% African American, 1.63% from other races, and 3.25% from two or more races. Hispanic or Latino of any race were 4.88% of the population.