Just to list the ones I've played that are marked as "RIP":
Lakewood King County (original layout) - Somebody mentioned this already. The county decided to build condos or something on top of the original holes 1, 2, 3, 17, and 18, so they had to do a redesign. While the redesign has its flaws, it also includes two water holes and a pro shop.
Dalaiwood - If you don't know about Dalaiwood, Google it. I don't have enough time to write about it right now.
Bicentennial Park in Mountlake Terrace, WA - It was a joke, but it's still the only pole course I've played so it deserves a mention. They never officially closed it. Several of the poles and tee signs are still there, but a couple of those went when they did some brush clearing in the back of the park. It still looks exactly like it did the first time I played it, but it's done. Nobody goes there anymore. Terrace Creek is a mile away and actually fun.
Fircrest - One of only three courses I've played in the Seattle city limits. Fircrest was great for my friend because he lived nearby and was able to work on his drives and putts. It was a practice course though. Nothing more. There were a couple of baskets randomly placed in a field. No signage, no teepads... I never did actually play the course. I just threw back and forth between two baskets one afternoon to work on drives, and never saw the point in going back. I would now just to say that I've finished every course I've played, but the baskets were pulled a while back.