Aetna Township is located in Logan County, Illinois. As of the 2010 census, its population was 535 and it contained 228 housing units. The median age of Aetna Township's residents was 42.9 years. Among non-Hispanics, the racial makeup of the township included 517 white, 1 American Indian, 3 Asian, 1 Some Other Race, & 5 mixed race persons. Aetna Township contained 8 persons of Hispanic origin.