High Quality Content by WIKIPEDIA articles! Grand Forks is the third-largest city in the U.S. state of North Dakota (after Fargo and Bismarck) and the county seat of Grand Forks County. According to the 2010 census, the city`s population was 52,838, while that of the city and surrounding metropolitan area was 98,461. Grand Forks, along with its twin city of East Grand Forks, Minnesota, forms the center of the Grand Forks, ND-MN Metropolitan Statistical Area, which is often called Greater Grand Forks or The Grand Cities.