The population was 2,106 at the time of the 2020 census,[2] a decrease from the figure of 2,375 that was tabulated in 2010.

[3] Plum Creek Township appears in the 1876 Atlas of Armstrong County, Pennsylvania.

[5] Plumcreek Township is located in southeastern Armstrong County.

[3] As of the 2000 census,[12] there were 2,304 people, 877 households, and 678 families residing in the township.

18.8% of all households were made up of individuals, and 7.9% had someone living alone who was sixty-five years of age or older.