South of Marshall County on U.S. Highway 59 is Pennington County (pop. 13,930); it was separated from neighboring Red Lake County in 1910. The county seat is Thief River Falls (pop. 8,573).
The former Soo Line Depot in Thief River Falls, built in the American Craftsman style in 1913, was an important station on the main line between Minneapolis and Winnipeg. It once had 13 passenger trains a day; passenger service ended in 1967.
The Carnegie Library (1914) in Thief River Falls has been restored as a community center.
Author Gary Paulsen, who spent his early teen years in Thief River Falls, has written about how the librarian at the Carnegie Library inspired him to be an enthusiastic reader.
Thief River Falls has its own River Walk along the Lake and Thief rivers.
TRF native Ralph Engelstad donated $13.5 million for an arena for the high school ice hockey team.
The Peder Engelstad Pioneer Village has a museum and 19 historic buildings.
Seven Clans Casino, owned by the Red Lake Nation, is southeast of town.
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