franklin, walla walla, kittitas, yakima, and klickitat
The county seat of Ingham County is Mason. Michigan's capitol city, Lansing, is located in northwestern Ingham and northeastern Eaton counties (Charlotte is the county seat of Eaton County).
The county seat of Shiawassee County MI is Corunna.
The county seat of Wayne County, Michigan is Detroit.
Muskegon is in Muskegon County, Michigan, not in Mason county.