The Courthouse Square Association seeks to preserve and share the history of Eaton County, Michigan. To this end, the society operates a local history museum which is located within the 1885 Greek Revival Eaton County Courthouse. Exhibits include the judge's chambers, law library, circuit courtroom, town histories, a Victorian parlor, military artifacts, a one-room school, a 19th-century doctor's office, Native American artifacts, and a 20th-century farm kitchen. Collections include more than 13,000 artifacts.

The museum offers exhibits and period rooms. School and tour groups are asked to make reservations.