Polk County is a county located in the U.S. state of Minnesota. The population was 31,600 at the 2010 census. Its county seat is Crookston, and the largest community is East Grand Forks.Polk County is included in the Grand Forks, ND-MN Metropolitan Statistical Area.HistoryPolk county was named after the country's 11th president, James K. Polk, who on March 3, 1849, signed the Congressional act organizing the Minnesota Territory. The county was formed on July 20, 1858 and formally organized in 1872-73.
