 knife river is a census-designated place (cdp) in richland county, montana, united states. the population was 320 at the 2010 census. ==geography== knife river is located at  (47.453610, -104.344938). according to the united states census bureau, the cdp has a total area of , all of it land. ==demographics==  as of the census{{cite web|url=http://factfi
Census-designated_places_in_Montana Census-designated_places_in_Richland_County,_Montana