Professional organizations exist to promote the interests and issue of their members' profession. They serve as an excellent source for professional development information and a gateway to all manner of relevant resources for practitioners. As well as the national primary organization, you will often be able to find either a state level chapter of that organziation or a state level organization.

American Association of School Librarians
A division of the American Library Association (ALA) devoted to all aspects of school librarianship. Other divisions of ALA of particular interest for school librarians include: the Young Adult Library Services Association (YALSA) and the Association Library Service to Children (ALSC).

Oregon Association of School Librarians
The state level professional association.

AASL Affilate Organizations
Find the state school library organization of interest to you