Traill County is a county in the U.S. state of North Dakota situated in the eastern part of the state along the Red River valley. According to the 2010 census, the county had 8,121 residents. The county seat is Hillsboro, while Mayville is the largest city by population. These towns, together with several small townships and farming communities, make up a sparsely populated, agriculture-oriented region.

Geography and landscape

Traill County occupies low, fertile plains that are characteristic of the Red River Valley. The terrain is generally flat and well suited to row crops and pasture. Seasonal runoff and spring thaw on the Red River can lead to flooding in low-lying areas, so land use and local planning often take flood risk into account. Rural roads, county-maintained infrastructure and a network of township roads connect farms and settlements.

History and settlement

Before Euro-American settlement the area was home to Indigenous peoples who used the river valley for hunting and seasonal movement. European-American settlement expanded in the 19th century as agriculture and rail access encouraged towns to develop. The county government grew to provide local services such as courts, public records, and road maintenance, and small towns developed centers of commerce, education and local government.

Economy, education and land use

The county economy is primarily agricultural, with family farms and commercial growers producing staples suited to the northern plains climate. Crops commonly raised in the Red River valley include corn, wheat and soybeans, alongside livestock operations. Education and local services also contribute to the economy; for example, campuses and schools in the county serve as employment and cultural centers. Small businesses, light industry and service providers support rural populations.

Communities and notable facts

Hillsboro, as the county seat, hosts administrative offices and local courts. Mayville, the largest community, is a regional hub for education and commerce and is known locally for its college campus and community events. The county contains multiple small towns and many dispersed farmsteads rather than large urban centers. Residents and visitors find a landscape shaped by agriculture, community-focused towns, and seasonal rhythms tied to planting and harvest.

For local government, historical records, demographic updates and services, residents consult county offices and regional resources that maintain current information about planning, emergency management and community programs.