[2] The county is named for the chief of the Fox tribe who signed the treaty ending the Black Hawk War.

It lies along Interstate 80 between Des Moines and Iowa City.

[4] The Poweshiek County Courthouse, completed in 1859, is listed on the National Register of Historic Places.

The county website provides names and contact information for the current supervisors.

[6] Poweshiek County is served by Grinnell Regional Medical Center, an acute care hospital licensed for 81 beds.

There were 8,556 housing units at an average density of 15 per square mile (5.8/km2).

Poweshiek County is served by three community school districts: [19] (inc. parochial) Poweshiek County is home to Grinnell College, a small liberal arts college founded in 1846.

The population ranking of the following table is based on the 2020 census of Poweshiek County.