Grand Marais is a city in Cook County, Minnesota, United States. The population was 1,351 at the 2010 census. It is also the county seat of Cook County. Grand Marais is French for “Great Marsh,” referring to a marsh, which in early fur-trading times was 20 acres (81,000 m2) or less in area, nearly at the level of Lake Superior, and situated at the head of the little bay and harbor that led to the settlement of the village there.