Brunswick is located at 41°12′54.63″N 81°51′17.92″W / 41.2151750°N 81.8549778°W / 41.2151750; -81.8549778 (41.2151763, -81.8549783),[2] According to the United States Census Bureau, the township has a total area of 12.00 square miles (31.08 km2), all land.

Located in the northern part of the county, it borders the following townships and cities: The city of Brunswick occupies the center and northeast of the township.

The top five reported ancestries (people were allowed to report up to two ancestries, thus the figures will generally add to more than 100%) were English (92.2%), Spanish (0.5%), Indo-European (5.4%), Asian and Pacific Islander (1.5%), and Other (0.4%).

As of the 2020 census, there were 11,196 people, 4,375 households, and _ families residing in the township.

[7] The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1.