The median age in Parnell township, Polk County, Minnesota is 36.5, as per 2021 ACS 5-Year Estimates. Of the total population, 3.45% were under the age of 15, 45.98% aged 15 to 29, 29.89% aged 30 to 64, 14.94% aged 65 to 84, and 5.75% were 85 years of age and older.