The Birds
Seattle Audubon's Birdweb provides in-depth information about the birds of the state and where to find them. This includes in which habitats, in which regions, in which months and with what frequency each species is found. It also provides information about behavior, nesting, diet and migration and conservation status.
The Washington Ornithological Society (WOS) has much birding information including checklists, site guides and searchable newsletter archives.
Tweeters rare bird alerts cover the entire state of Washington. Recent Tweeters posts.
Recent eBird Sightings
Birding Trails
Where to Find Birds
A Birder's Guide to Washington covers the entire state and includes detailed site descriptions with good maps. This is the guide used by serious local birders. More books and maps.
Birder's Dashboard has recent sightings from eBird for Washington and its counties.