"Birdtrax Slater" in a browser provides fast access to this page or you can bookmark counties in Google sites.  As of 1 Jan 2015, Birdtrax only provide one useful tab - rarities.  Checklist for counties or regions are available via the ebird site.  These are useful to review what others have seen and who has been out birding.

Washington State (rarities takes awhile)

Washington State (recent checklists) 

Washington State (counties counts, counties are selectable)

King Co., WA (rarities)

King Co., WA (via ebird)

Pierce Co., WA (rarities)

Pierce Co., WA (via ebird)

Clallam Co., WA (rarities)

Grays Harbor Co., WA (rarities)

Jefferson Co., WA (rarities)

Kitsap Co., WA (rarities)

Kitsap Co., WA (recent checklists via ebird)

Lewis Co., WA  (rarities)

Mason Co., WA (rarities)

Pacific Co., WA (rarities)

Skagit Co., WA (rarities)

Snohomish Co., WA (rarities)

Thurston Co., WA (rarities)

Wahkiakum Co., WA (rarities)

Whatcom Co., WA (rarities)

Washington State (takes awhile)

Ebird NW

The filters for country records in Birdtrax seem to be working as of 22 Oct 2014, GWS.