|The following is based on pre-release information for the canceled online game codenamed Project V13 and is not considered canon.|
Seattle was a pre-War city in the state of Washington in the Northwest Commonwealth. One of its major landmarks is the Space Needle, which seems to have survived the War. Unlike the Core Region or the Capital Wasteland, Seattle is, at least in the winter, covered in snow.
Seattle appeared in a piece of concept art for Interplays Project V13, the canceled Fallout MMO, where the Space Needle is clearly visible. It is not known whether it was intended to actually appear in-game; As Interplay have lost the Fallout MMO license as a result of Bethesda v. Interplay it is also unknown if it will appear in any non-Fallout version of the game.
Seattle was also to appear in the canceled Fallout Extreme.