Popple Township was named after the poplar tree.

As of the census[1] of 2000, there were 564 people, 207 households, and 151 families residing in the township.

The population density was 16.2 people per square mile (6.2/km2).

There were 207 households, out of which 34.8% had children under the age of 18 living with them, 63.3% were married couples living together, 4.8% had a female householder with no husband present, and 26.6% were non-families.

20.3% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older.