Fargo is the most populous city in the State of North Dakota, accounting for nearly 16% of the state population. Fargo is also the county seat of Cass County. According to the 2014 United States Census estimates, its population was 115,863. Fargo, along with its twin city of Moorhead, Minnesota, as well as adjacent West Fargo, North Dakota and Dilworth, Minnesota, form the core of the Fargo-Moorhead, ND-MN Metropolitan Statistical Area, which in 2014 contained a population of 228,291. In 2014, Forbes magazine ranked Fargo as the fourth fastest-growing small city in the United States.