I will do the 39th, 40th and 42nd districts, as they are the districts in the area where I live.
39th (most of Skagit, east Whatcom, east Snohomish Counties) : solid Republican in both positions, not worth explaining in detail
40th (south Bellingham, north and west Skagit County, San Juan County) Position 1: Representative Dave Quall, a Democrat, is retiring this year. There are 8 candidates running to replace him. The probable Republican to advance past the primary is Mike Newman. The Democrats are Tom Pasma and Justin van Dyk. Doug Revelle is running under the Happiness Party label. lean Republican
Position 2: Incumbent Jeff Morris will probably face Republican John Swapp in the general election. Green Party member Howard Pellett is also running in the primary. Tossup
42nd (Whatcom County not covered by the 40th and 39th) Position 1: Incumbent representative Doug Eriksen is retiring to run for the Senate. The Democrats in the primary are Al Jensen and Whatcom County businessman Richard May. The Republicans are Jason Overstreet and Michael Smith, teacher at the high school I attended. Farmer Craig Mayberry is running as an Independent. Tossup
Position 2: Republican Vincent Buys is challenging incumbent Democrat Kelli Linville. lean Democrat