Reis Township is a township in Polk County, Minnesota, United States. It is part of the Grand Forks-ND-MN Metropolitan Statistical Area. The …Reis Township is a township in Polk County, Minnesota, United States. It is part of the Grand Forks-ND-MN Metropolitan Statistical Area. The population was 74 at the 2000 census. Reis Township was organized in 1880, and named for George Reis, a pioneer settler.