Valley City is a city in Barnes County, North Dakota, United States. It is the county seat of Barnes County. The population was 6,585 during the 2010 census, making it the thirteenth 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".