The Two Rivers post office opened in 1912 and changed its name to Dos Rios in 1915.[2] The name comes from the place's proximity to the confluence of the Middle Fork of the Eel River with the Eel River proper.[2] Dos Rios was served by Northwestern Pacific Railroad passenger service until 1971.
^ abcdDurham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 51. ISBN1-884995-14-4.