Otter Tail County is a county in the U.S. state of Minnesota. As of the 2020 census, the population was 60,081, and it was estimated at 61,041 in 2025. The county seat and the largest city is Fergus F
The Otter Tail County Courthouse in Fergus Falls
Historic marker for Tordenskjold, which was made the county seat in 1870 by the Minnesota legislature, a decision rescinded the following year