Hardin Precinct is located in Calhoun County, Illinois.

[3] As of the 2020 census[2] there were 1,170 people, 394 households, and 283 families residing in the precinct.

There were 519 housing units at an average density of 21.00 per square mile (8.11/km2).

The racial makeup of the precinct was 95.81% White, 0.09% African American, 0.09% Native American, 0.43% Asian, 0.00% Pacific Islander, 1.03% from other races, and 2.56% from two or more races.

21.10% of all households were made up of individuals, and 8.90% had someone living alone who was 65 years of age or older.