Hi Barbara, I found William and Elsie Halberg living in 1930 in Durham, King Co., WA. William J., b. WI, 36 yrs old, laborer saw mill; Elsie, b. SD, 25; William E., b. WA 5; John R., b. WA, 3 and Elsie Vidal b. WA, months old.
The 1930 Census is the most recent one available to the public. After that Census it is more difficult to find info about people.
I'd contact the South King County Genealogy Society, www.rootsweb.ancestry.com/~waskcgs/ to find out if they appear on tax records, County directories, etc.Also they should have the State Death Index on microfilm and can look up when William and Elsie died.
Fred and Mary Johnson in 1930 were living in Cosmopolis, Grays Harbor Co., WA. Fred, b. SD, 40 yrs old, fireman lumber mill; Mary E., b. SD, 46; Charles F., b. WA, 5; James W. Wheeler, stepson, b. SD, single, 20, sawyer tub factory and Robert Wheeler, stepson, b. SD, 17, single, stove ____ tub factory.
Fred and Mary are much more problematic with the surname of Johnson. I'd contact the Grays Harbor Genealogical Society, http://users.techline.com/ghgs/target.htmlhttp://users.techline.com/ghgs/target.html. Hopefully they will have the same sources as mentioned above. Successful Hunting!