The median age in Donnelly township, Marshall County, Minnesota is 30.0, as per 2021 ACS 5-Year Estimates. Of the total population, 0.00% were under the age of 15, 50.00% aged 15 to 29, 37.50% aged 30 to 64, 12.50% aged 65 to 84, and 0.00% were 85 years of age and older.