[3] The township is part of the Lansing–East Lansing metropolitan area and mostly surrounds the city of Mason, but the two are administered autonomously.

The area was first surveyed as early as 1824, and the current eastern boundary of the township is along the Michigan meridian.

The village of Mason was part of Vevay Township until it incorporated as a city in 1875.

[4] The Jackson, Lansing and Saginaw Railroad ran a railway line through the township beginning in 1844 and had two station along the route—one as Mason Centre and another at Eden.

[5] The first township hall was a wood structure built as early as 1890.

12.8% of all households were made up of individuals, and 4.5% had someone living alone who was 65 years of age or older.