Yellowstone County is named for the Yellowstone River, which is named for the yellow rocks found along the river.
Surrounding County Courthouses:
N – Golden Valley County, Musselshell County and Rosebud County
E – Treasure County
S – Big Horn County
W – Carbon County and Still\water County
Created: February 26, 1883 
County Seat:
Billings 1883 – present
County Courthouse – Billings
Location: 217 North 27th Street / 3rd Avenue North
Built: 1956 – 1958
Style: Modern
Architect: Chandler C Cohagen and Loners, Stoebe & Johnson
Contractor: C B Lauch Construction
Description: The building faces north and is an eight story buff colored brick, concrete and glass structure. The building is located in the center of Billings. The building has an entrance on the north and west sides with overhanging canopies. Brick facing runs horizontally on the first and top stories and vertically at the corners with a clock at the top of the northwest corner. The roof line is flat. The building houses the County District Court of the 13th Judicial District.
History: The county was created in 1883 and Billings was selected as the county seat. The county used rented premises. The first courthouse was a three story structure designed by C E Bell and built by Foley & Crowe in 1905.The second and present courthouse was constructed in 1956 to 1958.
County Courthouse – Billings
Photos taken 2009 and 2015