Hillsboro is a city in Traill County, North Dakota in the United States. It is the county seat of Traill County. The population was 1,563 at the 2000 census. Hillsboro was founded in 1881. Hillsboro sits in the fertile Red River Valley. Local agriculture has dominated the area's economy from the beginning. With its location on Interstate 29, halfway between the two metropolitan centers of Greater Grand Forks and Fargo-Moorhead, Hillsboro has seen steady population growth in recent years and has become somewhat of a bedroom community. Hillsboro is known for having the oldest weekly newspaper in the state, the Hillsboro Banner.