The Montgomery County Courthouse is located at Court Square in the center of Mount Ida, the county seat of Montgomery County, Arkansas. It is a two-story masonry structure, distinctively blending local rustic character with Classical Revival styling. Its walls are fashioned out of randomly laid fieldstone, but features a projecting entry section with a fully pedimented gable with an oriel window at its center. The courthouse was built in 1923 to a design by Clyde A. Ferrel.

The building was listed on the National Register of Historic Places in 1976.

See also National Register of Historic Places listings in Montgomery County, Arkansas

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