Auburn is a city in Bay County, Michigan, United States.

It is included in the Saginaw, Midland, and Bay City metropolitan area.

On November 19, 1877, the Skinner Post Office was renamed Auburn.

The default Zip Code of 48611 is shared by Williams Township (which surrounds the city), and much of southwestern Bay County.

There were 960 housing units at an average density of 914.3 per square mile (353.0/km2).

34.5% of all households were made up of individuals, and 13.5% had someone living alone who was 65 years of age or older.

29.1% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.

Special Note: The city's eastern overpass on US10 only exits from and to the east.