Living and Loving Life Where Two Rivers Meet Thief River Falls Area Information, Events, and Opportunities ; Area websites Find What You Are Looking For Advance Thief River Business resources, finance, housing, community information, and economic development information. City of Thief River Falls City departments and services, fire, police, City government, zoning, utilities, and more. Pennington County Official website of Pennington County with information on all County departments and services. TRF Chamber of Commerce Business directory, community calendar, community events, and business networking. Visit Thief River Falls Visit TRF website has everything you need to plan your trip to TRF, including lodging, recreation, amenities, shopping, dining, events, and more. Thief River Falls Community Calendar The Community Calendar is hosted by the TRF Chamber of Commerce and features events from across the community.