St. Mary Township, Hancock County, Illinois

[2] As of the 2020 census[1] there were 568 people, 278 households, and 184 families residing in the township.

There were 295 housing units at an average density of 7.98 per square mile (3.08/km2).

The racial makeup of the township was 97.36% White, 0.70% African American, 0.00% Native American, 0.35% Asian, 0.00% Pacific Islander, 0.53% from other races, and 1.06% from two or more races.

There were 278 households, out of which 20.90% had children under the age of 18 living with them, 57.19% were married couples living together, 5.04% had a female householder with no spouse present, and 33.81% were non-families.

30.20% of all households were made up of individuals, and 9.40% had someone living alone who was 65 years of age or older.

Map of Illinois highlighting Hancock County