Several helpful gazetteers of Oregon have been published. Two of the most helpful are:
McArthur, Lewis A. Oregon Geographic Names. 6th ed. Portland, Oregon: Oregon Historical Society, 1992. (FHL book 979.5 E2m 1992.)
R. L. Polk & Co. Oregon and Washington Gazetteer and Business Directory, 1909-1910. Seattle, Washington: R.L. Polk, 1909. (FHL film 1000367.)
Many Maps can be found on-line. To locate applicable maps use a search engine such, as Google, and terms such as Oregon Gazet(t)eer or Maps.