Fallon County is named for Benjamin O’Fallon, who was a Federal Native American agent.
Surrounding County Courthouses:
N – Prairie County and Wibaux County
E – Golden Valley County, North Dakota, Slope County, North Dakota, Bowman County, North Dakota and Harding County, South Dakota
S – Carter County
W – Custer County
Created: December 9, 1913 
County Seat:
Baker 1913 – present
County Courthouse – Baker
Location: 10 West Fallon Avenue / 1st Street West
Built: 1974 – 1975
Style: Modern
Architect: Johnson/Graham Associates
Contractor: Miller Construction Company
Description: The building faces north and is a one story dark red colored brick, concrete and glass structure. The building is located on landscaped grounds in the center of Baker. The building has vertical red colored brick pillars along the walls with a hipped red colored roof above. The entrance located in the center of the north side, has glass doors. The widows are vertical and narrow. In the interior is an entrance lobby. The County District Court courtroom is located on the northwest side and has a small skylight. The Commissioner’s Room is on the south side of the building. The building houses the County District Court of the 16th Judicial District and County Justice Court. The building also houses the City of Baker. To the southeast is the old County Sheriff Residence and Jail which is now the O’Fallon Historical Museum built in 1916.
See: The 16th Judicial District includes Carter County, Custer County, Fallon County, Garfield County, Powder River County, Rosebud County and Treasure County.
History: The county was created in 1913 and Baker was selected as the county seat. The first courthouse was a two story frame structure bu designed by Link & Haire and constructed in 1915. The second and present courthouse was constructed in 1974 to 1975.
County Courthouse – Baker
County District Court courtroom
Commissioner’s Room
Old County Sheriff’s Residence and Jail – Baker
Photos taken 2009, 2015 and 2022