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North Dakota Counties

There are fifty-three counties in the state of North Dakota. Pembina County was created by the 1866-1867 Dakota territorial legislature, and was organized on August 12, 1867. The city of Pembina, the oldest European-American settlement in the state, was the county seat from 1867 to 1911. The seat was relocated to Cavalier.

Traill County, North Dakota

Traill County Education, Geography, and HistoryTraill County, North Dakota Courthouse

Traill County is a county located in the state of North Dakota. The 2010 census listed the population at 8,121. Traill County was created in 1875 by the 1874-75 territorial legislature. Its county seat is Hillsboro, and its largest city is Mayville. It was named after Walter John Strickland Traill, an employee of the Hudson's Bay Company and son of Canadian pioneer Catharine Parr Traill.

County headquarters were originally located in a small single-story building in Caledonia. Several replacement courthouses were build 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

Etymology - Origin of Traill County Name

Named for Walter John Strickland Traill (1847-1933) who, as an employee of the Hudson's Bay Co., became a resident of the future county in 1870.


County QuickFacts: CensusBureau Quick Facts

Traill County History

Created by the 1874-75 territorial legislature and named for Walter John Strickland Traill (1847-1933) who, as an employee of the Hudson's Bay Co., became a resident of the future county in 1870. Government organized: February 23, 1875. County Seat: Caledonia, 1875-1891; Hillsboro, 1891-present.

Geography: Land and Water

As reported by the Census Bureau, the county has a total area of 863 square miles (2,240 km2), of which 862 square miles (2,230 km2) is land and 0.6 square miles (1.6 km2) (0.07%) is water.

Neighboring Counties

Bordering counties are as follows:

  • Grand Forks County (north)
  • Polk County, Minnesota (northeast)
  • Norman County, Minnesota (east)
  • Cass County (south)
  • Steele County (west)


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