Thief River Falls is a city located in Pennington County, Minnesota, United States. It is the county seat of Pennington County and has a population of approximately 8,675 people. The city is named after the falls of the Red Lake River, which was a popular site for fur traders and Native Americans. Thief River Falls is known for its outdoor recreational opportunities, including hunting, fishing, and snowmobiling. It is also home to several industries, including a major electronics manufacturing company, Arctic Cat. The city has a strong sense of community, with various events and festivals held throughout the year.