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Mason is the county seat of Ingham County in the U.S. state of Michigan. The population was 8,252 at the 2010 census. Mason was named after Stevens T. Mason, the state's first governor.

The Ingham County Courthouse is an historic government building located at 315 South Jefferson Street in Mason, Ingham County, Michigan. It occupies an entire city block bounded by South Jefferson, East Ash, South Barnes and East Maple Street. Constructed from 1902 to 1904, it is Ingham County's third courthouse and the second on this block, which is directly north of the site of the first courthouse.

The Ash Street-Sycamore Creek Bridge is a historic bridge located on Ash Street (MI-36) over Sycamore Creek in Mason, Michigan . It was listed on the National Register of Historic Places in 1999. It is one of the oldest T-beam bridges in Michigan.

The Merrylees-Post House is a single-family home located at 519 West Ash Street in Mason, Michigan. It was listed on the National Register of Historic Places in 1985.

The Philip Nice House is a single-family home located at 321 Center Street in Mason, Michigan. It was listed on the National Register of Historic Places in 1985.

The Michigan Central Railroad Mason Depot is a former railroad depot located at 111 North Mason Street in Mason, Michigan. It was listed on the National Register of Historic Places in 1985. It was remodeled into a restaurant, and is now the home of the Mason Depot Diner.