Lake Township, Mercer County, Pennsylvania

As of the census[6] of 2000, there were 706 people, 232 households, and 187 families residing in the township.

There were 246 housing units at an average density of 15.5/sq mi (6.0/km2).

The racial makeup of the township was 98.44% White, 0.57% African American, and 0.99% from two or more races.

There were 232 households, out of which 37.1% had children under the age of 18 living with them, 72.8% were married couples living together, 5.2% had a female householder with no husband present, and 19.0% were non-families.

16.4% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older.