where can I get a listing of tutors in Portland Oregon for 3-5 grade reading and writing ?

Answer 1

I found some tutors in my area by advertising on www.craigslist.org

Answer 2

Either go to an Educational Center like Sylvan or Kaplan, or post a couple signs around the Elementary Education department at a local university.

Your public library may have a "Reading Buddy" program but the buddies are usually teens, not educators.