LaMoure County, North Dakota: History
The Dakota Territory legislature created the county on January 4, 1873, with Grand Rapids as the county seat. However, the county organization was not completed at that time, nor was the county attached to another county for administrative and judicial purposes. It was named for Judson LaMoure, a member of the territorial/state legislature from 1872 to 1918.
The county organization was affected on October 27, 1881. Its boundaries were altered in February 1881 and in March 1883. It has retained its present boundary since that time. The present county seat, LaMoure, was founded in 1882, and the county seat was transferred to that community soon after.