[3] It is included in the Bay City Metropolitan Statistical Area.

The Arn Post Office was reopened on April 20, 1894, lasting until July 30, 1904.

[10] As of the census[1] of 2010, there were 1,441 people, 554 households, and 430 families residing in the township.

There were 554 housing units at an average density of 17.5 per square mile (6.8/km2).

18.9% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older.