Crookston is a city in the U.S. state of Minnesota. It is the county seat of Polk County. The population was 7,891 at the 2010 census. It is part of the "Grand Forks, ND-MN Metropolitan Statistical Area" or "Greater Grand Forks".Crookston is the episcopal seat of the Roman Catholic Diocese of Crookston. Since Crookston is close to the larger city of Grand Forks, North Dakota, many people who live in Crookston commute to jobs in the Grand Forks area.