Wow, you're certainly looking at a good state for some secluded towns!
Have you checked the City-Data stats pages?
Washington Smaller Cities, Towns, and Villages (between 1000 and 6000 residents) - Real Estate, Housing, Schools, Residents, Crime, Pollution, Demographics and More
That page links to the pages of the towns with census pops of 1,000 to 6,000.
In Washington (and Oregon and Calif.) there's a green, moist western half on the west side of the mountains, and a much drier, warmer (or hotter) eastern side of the mountains that has variations of desert or scrub desert. Northeastern WA has less desert and more forest.
When you look at the stats of those towns, you might want to start making lists of what your important factors are in choosing a town, such as:
climate
jobs
schools
cost and availability of real estate or rentals
groceries, and other shopping
medical facilities
entertainment/activities/sports/internet/cable TV
public transportation
churches
community togetherness
degree of isolation during winter months
nearness to city facilities
and whatever else interests you and your family.
In most of the western states, in towns the size you mention there are not a lot of services or choices, since there is a very small population to serve. Hope the link helps!
