There is an Oregon Chicken Lovers page (mostly about chickens, but there are occasional posts about ducks), and then a much smaller group called Oregon Duck Lovers, you just have to look for the one not associated with being Oregon Ducks fans (not too hard...there is a photo of ducks as the profile photo). It seems a large number of people who post are closer to your area.
They are used for educational posts, questions, and plenty for rehoming. Just make sure you post it as a discussion thread/regular post and not an item for sale (although since it is livestock, it might be okay)