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Historical Markers in Pennington County
Thief River Falls is the county seat for Pennington County
Adjacent to Pennington County, Minnesota
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| On Knight Avenue South at 1st Street West, on the left when traveling north on Knight Avenue South. |
| On Main Avenue North (State Highway 32) just north of 1st Street East (County Highway 17), on the right when traveling north. |
Nov. 10, 2026