Prairie County is named for the prairie land of the Great Plains within the county.
Surrounding County Courthouses:
N – McCone County and Dawson County
E – Dawson County and Wibaux County
S – Fallon County and Custer County
W – Garfield County
Created: February 5, 1915 
County Seat:
Terry 1915 – present
County Courthouse – Terry
Location: 217 West Park Street / Logan Avenue
Built: 1997 – 1998
Style: Modern
Architect: Stevenson Design of Miles City
Contractor: Fire Mountain Construction of Colstrip
Description: The building faces south and is a one story gray metal clad structure. The building is located on landscaped grounds in the center of Terry. The south front has a central entrance with small windows towards the east side. The roof is pitched. The building houses the County District Court of the 7th Judicial District and County Justice Court.
Old County Courthouse – Terry
Location: Garfield Avenue
Built: 1915
Style: Federal
Architect: Unknown
Contractor: Unknown
Description: The building is a one and a half story white colored wood frame structure. The building is located on landscaped grounds in the center of Terry to the west of the courthouse. The front section projects from the main building and has a central entrance. The roof is hipped. The building was damaged by fire on August 25, 1995.
See: The 7th Judicial District includes Dawson County, McCone County, Prairie County, Richland County and Wibaux County.
History: The county was created in 1915 and Terry was selected as the county seat. The first courthouse was a one story frame structure built in 1915. The second and present courthouse was constructed in 1997 to 1998.
County Courthouse – Terry
Photos taken 2009