Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Otter Tail County is a county located in the U.S. state of Minnesota. As of 2000, the population was 57,159. Its county seat is Fergus Falls. According to the U.S. Census Bureau, the county has a total area of 2,225 square miles (5,762 km²), of which 1,980 square miles (5,127 km²) is land and 245 square miles (635 km²) (11.02%) is water. According to the official web site, Otter Tail County contains over 1000 lakes and two Minnesota state parks, Maplewood and Glendalough. The highest point in Otter Tail County is Inspiration Peak in the Leaf Mountains, at 1750 feet above sea level.