Traill County is a county in the U.S. state of North Dakota. As of the 2020 census listed the population at 7,997. Its county seat is Hillsboro, and its most populous city is Mayville. The Dakota Territory legislature created the county on January 12, 1875, with areas partitioned from Burbank, Cass, and Grand Forks counties. It was named for Walter John Strickland T…Traill County is a county in the U.S. state of North Dakota. As of the 2020 census listed the population at 7,997. Its county seat is Hillsboro, and its most populous city is Mayville. The Dakota Territory legislature created the county on January 12, 1875, with areas partitioned from Burbank, Cass, and Grand Forks counties. It was named for Walter John Strickland Traill, an employee of the Hudson's Bay Company and son of Canadian pioneer Catharine Parr Traill. The first county building was a small single-story building in Caledonia. Several replacement courthouses were built during the late 19th century and several votes to move the county seat to Mayville narrowly failed. Efforts to move the county seat to Hillsboro were more successful, and all county records were moved there in 1890. Construction of the current county building began in 1905; it is now listed on the National Register of Historic Places.
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