We have two gyms to add to the Portland, OR area.
Both gyms are woman-owned, and both come highly recommended.
First we have GIRLS Gym. They offer multiple classes including self-defense. Check them out.
Also, we have Fierce Fitness. They are not a self-defense class, but they are a femme-centric cardio kickboxing class that places an emphasis on proper form and people walk away from there stronger, more agile, and more confident.