Agencies across King County are helping students prepare for school by making sure they have school supplies. King County 211 has compiled a list of programs that are open to the public. You can view the list here: King County School Supplies.
Keep checking the list as resources may change, or you may call 2-1-1 directly.
There are other agencies in King County which have school supplies available only for their established clients. Additionally, many school districts provide school supplies through their homeless liaison programs.