Hi, because this is so recent you're going to need tax records or access to Umatilla County Directory or other means to find these folks.

I'd contact Blue Mountain Gen. Soc. (Umatilla Co), www.uci.net/~sandral/. Most Gen. Soc's will do research for a reasonable fee and have Polk Directories, tax records, etc.

Another place to look is Umatilla County Resources, http://gesswhoto.com/um-resources.html. Good Luck & Happy New Year!