Can't wait to have another OC fan in Washington! If you are in the area, we are having a
BBQ on the 25th of September for OC. You can learn a lot there and bring your firearm.
Anyways, I will try to sum it up as I know it. However, I suggest that you read the laws yourself regarding the restricted areas.
Washington State overrides any local codes or laws, so you only need to concern yourself with Washington State laws (with the exception of stadiums and convention centers - where you can ONLY cc freely if local code restricts open carry).
DO NOT CARRY IN MENTAL HOSPITALS
DO NOT CARRY IN PLACES REQUIRING YOU BE 21 OR OVER
DO NOT CARRY IN ANY RESTRICTED LAW ENFORCEMENT OFFICE (i.e. jails, detention centers, confinement areas)
DO NOT CARRY IN ANY COURTHOUSE OR ANY AREAS LINKED TO COURTHOUSES
DO NOT CARRY ON SCHOOL GROUNDS
You can carry on school grounds when picking up or dropping off a student, however you may not carry in a school building.
Everything else is fair game. There are a few minors laws regarding music festivals or fairs, in which case I would suggest you look into them yourself if you plan on going to one. This site offers links to the RCWs regarding those laws.
For all the restricted areas above, it does include areas of entering or exiting. Also, in the case with the law enforcement offices, it does not include areas open to the general public (i.e. sheriff's office). If you are unsure of the laws regarding a police station (like you are trying to go to the front desk) just look for signs saying "no firearms." If nothing is posted, then you should be free to enter. Just be aware, a police officer may ask you to leave. I recommend leaving and calling the Sheriff of your County.
You can carry openly and loaded anywhere else so long as you do not intentionally intimidate or warrant alarm. Never draw your firearm unless it is in self defense, otherwise you are guilty of gross misdemeanor.
I hope this helps. If you have any questions, check the FAQs.
Joe~