Fargo is the most populous city in the U.S. state of North Dakota. The population was 125,990 at the 2020 census and estimated at 136,285 in 2024. Fargo and its twin city of Moorhead, Minnesota, form the core of the Fargo–Moorhead metropolitan area, which had a population of 248,591 in 2020. It is the county seat of Cass County.