As of the 2020 United States Census, Aetna Township has a population of approximately 2,284 residents. The population growth has remained relatively stable over the past two decades, indicative of its established rural character.
The community is predominantly White/Caucasian, with small populations of other ethnic backgrounds. The age distribution skews slightly older than the national average, reflecting a mix of established families drawn to the local school district and retirees enjoying the quiet, rural environment. The vast majority of households are families, and homeownership rates in the township are exceptionally high compared to urban areas.