[1] According to the 2021 census gazetteer files, Young Hickory Township has a total area of 24.22 square miles (62.73 km2), all land.

As of the 2020 census[1] there were 548 people, 285 households, and 206 families residing in the township.

There were 260 housing units at an average density of 10.74 per square mile (4.15/km2).

The racial makeup of the township was 96.17% White, 0.55% African American, 0.18% Native American, 0.00% Asian, 0.00% Pacific Islander, 0.00% from other races, and 3.10% from two or more races.

24.90% of all households were made up of individuals, and 7.40% had someone living alone who was 65 years of age or older.