Thief River Falls, sometimes abbreviated as TRF, is a city and county seat of Pennington County in the northwest portion of the U.S. state of Mi…Thief River Falls, sometimes abbreviated as TRF, is a city and county seat of Pennington County in the northwest portion of the U.S. state of Minnesota. The population was 8,749 at the 2020 census. Thief River Falls takes its name from a geographic feature, the falls of the Red Lake River at its confluence with the Thief River. The name of the river is a loose translation of the Ojibwe phrase Gimood-akiwi ziibi, literally, the "Stolen-land river" or "Thieving-land river", which originated when a band of Dakota Indians occupied a secret encampment along the river, hence "stealing" the land, before being discovered and routed by the neighboring Ojibwe. In the Treaty of Old Crossing of 1863, the Moose Dung's Indian Reservation was established on the west bank of the Thief River, at its confluence with Red Lake River. This Indian Reservation was dissolved in 1904 and their population incorporated as part of the Red Lake Band of Chippewa.
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