 willow river is a city in pine county, minnesota, united states, at the confluence of the kettle and willow rivers. the population was 415 at the 2010 census.{{cite web|title=2010 census redistricting data (public law 94-171) summary file|url=http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=dec_10_pl_gctpl2.st13
Cities_in_Minnesota Cities_in_Pine_County,_Minnesota