× Close Notification Window Otter Tail County Courthouse 121 West Junius Avenue #310 Fergus Falls, MN 56537 Phone: (218) 560-7045 Fax: (218) 998-8438 Contact by email Court Administrator: Trisha Mernitz Directions Free on-street surrounding courthouse. Office Hours: Mon-Fri 8 a.m.-4:30 p.m.