Seneca Williams Mill is a historic building located just outside of Maquoketa, Iowa, United States.

[2][3] The 2½-story stone building has a partial basement and is capped with a gable roof.

The location of the mill race can still be seen on the east side of the property, and permanents of the damn remain in Prairie Creek.

His daughter Tracy Costello Taylor has operated it since as a reception hall.

This article about a property in Jackson County, Iowa on the National Register of Historic Places is a stub.