|Traill County North Dakota Cities/Towns - Blanchard, Buxton, Caledonia, Clifford, Cummings, Galesburg, Greenfield, Hatton, Hillsboro (County Seat), Kelso, Mayville, Portland, Roseville
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Traill County is a county located in the U.S. state of North Dakota. The 2016 population at 8,030. Its county seat is Hillsboro
Traill county was created in 1875 by the 1874-75 territorial legislature. It was named after Walter John Strickland Traill, an employee of the Hudson's Bay Company and son of Canadian pioneer Catharine Parr Traill.