Formed in 1846 from part of Schuylkill Township, it is named for State Legislator Calvin Blythe.

At the 2000 census, there were 905 people, 386 households, and 250 families living in the township.

There were 421 housing units at an average density of 15.3/sq mi (5.9/km2).

The racial makeup of the township was 99.45% White, 0.33% Asian, and 0.22% from two or more races.

[4] Of the 386 households 21.5% had children under the age of 18 living with them, 50.5% were married couples living together, 9.3% had a female householder with no husband present, and 35.0% were non-families.