Aetna is a hamlet in southern Alberta, Canada within Cardston County, located east of Highway 2, approximately southwest of Lethbridge.The town was named in 1893 after Mount Etna.DemographicsAs a designated place in the 2016 Census of Population conducted by Statistics Canada, Aetna recorded a population of 113 living in 31 of its 33 total private dwellings, a change of from its 2011 population of 75. With a land area of 0.95km2, it had a population density of in 2016.