[4] Summit Township is in western Crawford County and contains the unincorporated community of Harmonsburg.

The northern end of Conneaut Lake is in the southeastern part of the township, and Conneaut Lake Park is partially in the township along its southern border.

The residential communities around the lake are part of the Conneaut Lakeshore census-designated place.

[4] As of the census[6] of 2000, there were 2,172 people, 902 households and 640 families residing in the township.

24.6% of all households were made up of individuals, and 9.3% had someone living alone who was 65 years of age or older.