Otter Tail County, Minnesota

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 Falls.

Otter Tail County comprises the Fergus Falls micropolitan statistical area. With 1,048, Otter Tail County has more lakes than any other county in the United States.