That's like asking "Where to get a Chicago Style Hot Dog In Chicago"
There's plenty of places I'm sure but the folks at Serious Eats went looking for 5 Great "Locals" places and came up with these.
I'm sure our Seattle Area RF'ers can name some more. http://www.seriouseats.com/2013/08/where-to-eat-seafood-in-seattle-washington.html
I don't remember seeing any of these places on any previous posts. Were They?