Grand Ronde is a census-designated place in Polk County, Oregon, United States. Originally named 'Grand Ronde Agency', the name of this city is a variation of the French Grande Ronde or 'fine large valley', a description given to the area by the employees of the Hudson's Bay Company, who were French-Canadian. The population was 271 at the 2000 census. Grand Ronde apartments for rent comparison page shows most up to date rent information on Grand Ronde apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.