[2] It is also one of three communities within the county to utilise the 814 area code, alongside New Florence and Seward.

[3] It is listed on the National Register of Historic Places along with the Laurel Hill Furnace.

As of the 2010 census,[6] there were 1,518 people living in St. Clair township, in 634 households (including 446 families).

Previously, in the census[7] of 2000, there were 1,398 people, 568 households, and 408 families living in the township.

25.4% of all households were made up of individuals, and 12.9% had someone living alone who was 65 years of age or older.