Cimarron County Courthouse, County courthouse and National Register of Historic Places site in Boise City, Oklahoma.

The Cimarron County Courthouse is an administrative building in Boise City featuring Neoclassical architectural details and red brick construction. The two-story structure sits at the center of town and houses local government offices and departments handling legal and property records.

The previous wood-frame courthouse burned down, prompting construction of the current building, which opened in 1926. It was designed by M.C. Parker in the Classical Revival and Neoclassical styles and built in red brick by Strong & Froman. The courthouse was added to the National Register of Historic Places on August 23, 1984.

The courthouse stands on a traffic circle where seven highways meet, including US-56, US-64, US-287, US-385 and US-412. The circle sends drivers north to Colorado, northeast to Kansas, west to New Mexico and southwest to the Texas Panhandle. The building was listed on the National Register of Historic Places on August 23, 1984.

The building can be viewed and photographed from outside, with its exterior easily accessible from the central plaza. It is best visited during daylight hours when light highlights the red brick facade and architectural details.

The 1943 practice bombs were filled with dynamite and sand, so the five that exploded caused little damage. The city kept the one that did not detonate. Boise City was long considered the only U.S. city bombed by its own military, until similar incidents came to light.