Becker Township is bordered on the southwest by the Mississippi River.

As of the census[1] of 2000, there were 3,605 people, 1,099 households, and 974 families residing in the township.

There were 1,285 housing units at an average density of 23.2 per square mile (9.0/km2).

There were 1,099 households, out of which 53.7% had children under the age of 18 living with them, 80.0% were married couples living together, 4.7% had a female householder with no husband present, and 11.3% were non-families.

7.0% of all households were made up of individuals, and 1.2% had someone living alone who was 65 years of age or older.