Sheridan County Court, formally known as the Sheridan County District Court, (Phone No. 406-765-3404, Fax 765-2602) and the Plentywood Justice Court (Phone No. 406-765-3409, Fax 765-3489) are both located in the same building. They are both in the Fifteenth judicial district of Montana. The judicial court handles violations of civic and traffic ordinances occurring throughout Sheridan county except those occurring within the city limits of Plentywood. The two major roads in this county are SR 5 and SR 15 which meet and run together through Plentywood.

Around 1889 when Valley county was created its county seat was Glasgow. However the Eastern residents of this new county found Glasgow to be too far and voted in 1913 to create Sheridan County with Plentywood as the county seat. Prior to this time cattle companies came here to take advantage of the miles of the free grass North of the Missouri River. Along with the cattlemen came the bank robbers, horse and cattle thieves and some mean outlaws. From 1901 through 19096 the cattlemen were plagued by prairie fires and severe winters. Around 1902 a stage line was created to run between Culbertson and Plentywood. The Sherwood Airport located near Plentywood has a runway approximately 3900 feet in length, a full parallel taxiway, lighting and other improvements. The annual Sheridan County fair is held at the end of July in Plentywood.