Valley City is a city in Barnes County, North Dakota in the United States. It is the county seat of Barnes County. The population was 6,585 at the 2010 census, making it the twelfth largest city in North Dakota. Valley City was founded in 1874.The city is known for its many bridges over the Sheyenne River including the Hi-Line Railroad Bridge. These bridges have earned it the distinction of being called the "City of Bridges". The city is also the home of Valley City State University and the home for the North Dakota High School Activities Association (NDHSAA).