It was listed on the National Register of Historic Places in 1981 as a part of the County Courthouses in Iowa Thematic Resource.

[4] A monument that was "Erected to the memory of the soldiers, sailors and marines of all wars" was built on the northwest corner of the courthouse square and dedicated on November 11, 1920.

There is another monument on the square to Knoxville resident Dixie Cornell Gebhardt, who designed the flag of the state of Iowa.

The main entrance is recessed in the pavilion behind triple bynian arches that are supported by granite columns.

The structure is surmounted by a large central tower with an open bell chamber, a four-faced clock, and an octagon shaped spire.