I used to live in Seattle for many years.

Shorty's if you are in downtown.
Add-a-ball in Fremont, a few miles north of downtown. You should go to Fremont/Ballard even if you aren't staying in that area. A lot of fun and interesting food and bar options.... Quite a few have a pinball or two in them.
The Tin Hat between Ballard and Phinney Ridge. Cool bar. Haven't been there in many years, but last time I WAS there, they had 3 machines in really good shape: Monster Bash, TOTAN and Junk Yard. They used to have 1 night a week when the machines were free play all day, just to get you in the bar. I'd call.
Dorky's Arcade in downtown Tacoma. It's a 45 minute drive (or can ride the commuter rail). They have about 25 machines..... Almost all the best 90's solid states, plus a lot of classic arcades.