I don’t know of any support groups specific for spouses in the area, although I think the Seattle CHADD group welcomes spouses. But I have also wished to find a group specific for spouses only, since that’s the boat I’m in.  I’m a little north of Seattle, maybe we could start one… 

I asked the NWCHADD mailing list if they knew of any, and someone recommended Don Baker’s couples support groups as a good resource: http://www.donbakerma.com/groups.html

Couple of options:

Don Baker, MA holds 4 workshops a year for couples that live with ADHD. The workshops address ADHD relationship issues and provide an opportunity for
non-ADHD spouses to connect. 
http://www.donbakerma.com/couplesworkshop01072012.pdf

I also agree with the previous post that the spouse with ADHD should look into joining Don Baker’s Life Strategies group… I have been in the groups for 2 years and the support, information and experience have led me to many positive changes in my life.
Don is outstanding!

http://www.addresources.org/
ADDResources holds support meetings and I know that the meetings held at the Greenwood Library address ADHD issues in one room and offer a support group for non-ADHD Spouses in another room.  I see it as a win-win as the ADHD spouse learns about ADHD issues and the non- ADHD spouse has the opportunity to connect with other non-ADHD spouses.  Essentially, both partners get time and support from their
own “tribe” members. 

Hope you are getting helpful answers!

I just created a new Meetup group for ADHD partners here: http://www.meetup.com/SeattleADHDPartners/

Please check it out!