The City of Northville is adjacent to the northern part of the township, but is administratively autonomous. Portions of Northville Township were incorporated into the Village of Northville, which later incorporated as the City of Northville. Portions of the Township have also since been annexed to the city. The most recent annexation was property owned by the City of Northville as part of the Rural Hill Cemetery. A majority of the township is served by Northville Public Schools. A small portion of the township is served by Plymouth-Canton Community Schools. The entire township is served by the Northville District Library and by its own police and fire departments.
There were 8,119 households out of which 28.6% had children under the age of 18 living with them, 60.5% were married couples living together, 6.3% had a female householder with no husband present, and 31.4% were non-families. 26.4% of all households were made up of individuals and 9.0% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.93.
In the township the population was spread out with 21.4% under the age of 18, 6.1% from 18 to 24, 29.8% from 25 to 44, 28.8% from 45 to 64, and 13.9% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 86.4 males. For every 100 females age 18 and over, there were 82.2 males.
The median income for a household in the township was $81,541, and the median income for a family was $101,998. Males had a median income of $76,460 versus $43,198 for females. The per capita income for the township was $40,258. About 1.4% of families and 2.5% of the population were below the poverty line, including 2.3% of those under age 18 and 3.3% of those age 65 or over.