Here are some open WikiProject Seattle tasks; some of these are not started, and all could use expansion and/or better referencing:

Suburbs: Shoreline, Lakewood, Kent, Auburn, Mercer Island
Neighborhoods: Beacon Hill, Magnolia, Rainier Valley, Sand Point, Madison Valley, Central District, Gatewood
Landmarks: Seattle Hebrew Academy, Paramount Theatre, Moore Theatre, Waiting for the Interurban
Parks: Seattle Parks and Recreation, List of parks in Seattle, Colman Park, Genesee Park, Interlaken Park, Jackson Park, McCurdy Park
Schools: List of schools of the Seattle School District needs to be updated, some schools do not have pages.
People: David Brewster, Stan Boreson, John Miller (Washington politician), Art Chantry, Henry Yesler, Victor Steinbrueck, Arthur A. Denny, Carson Boren, Emmett Watson, Timothy Egan
Transportation: First Avenue South Bridge, Salmon Bay Bridge
Government: Seattle City Council, King County Council, King County Executive
Companies: Dendreon, Cutter & Buck, Sur La Table, Briazz, Russell Investments, Un-Cruise Adventures
Night Life: Pioneer Square, Capitol Hill, Belltown, Fremont
Templates: Template:Seattle Corporations could use updated (2013) Fortune rankings for companies ranked 501–1000
Verify: add sources to Unreferenced BLPs